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1.  3β-Chloro-6-[2-(2-cyano­acet­yl)hydrazin-1-yl­idene]-5α-cholestane 
The asymmetric unit of the title compound, C30H48ClN3O, contains two mol­ecules, A and B. In both mol­ecules, the three cyclo­hexane rings in the steroid fused ring systems adopt chair conformations, while the cyclo­pentane rings adopt envelope and twist conformations in mol­ecules A and B, respectively. In mol­ecule B, the cyano group is disordered over two orientations with refined site-occupancies of 0.593 (8) and 0.407 (8). An intra­molecular C—H⋯N inter­action forms an S(10) ring in both mol­ecules. In the crystal, mol­ecules are linked by N—H⋯O, C—H⋯O and C—H⋯N inter­actions, resulting is chains propagating along the a-axis direction.
doi:10.1107/S1600536812009336
PMCID: PMC3344016  PMID: 22589925
2.  3β-Chloro-5α-cholestan-6-one 
The asymmetric unit of the title compound, C27H45ClO, consists of two crystallographically independent mol­ecules. In both mol­ecules, the three cyclo­hexane rings in the steroid fused-ring systems adopt chair conformations, while the cyclo­pentane ring adopts a half-chair conformation in one mol­ecule and an envelope conformation in the other. In the crystal, the mol­ecules are linked into a two-dimensional network by weak C—H⋯O hydrogen bonds. The crystal studied is a nonmerohedral twin with a refined ratio of twin components of 0.264 (3):0.736 (3).
doi:10.1107/S1600536812012482
PMCID: PMC3344147  PMID: 22606150
3.  4′-(4-Fluoro­phen­yl)-1′-methyl­dispiro­[indane-2,2′-pyrrolidine-3′,2′′-indane]-1,3,1′′-trione methanol hemisolvate 
The asymmetric unit of the title compound, C29H24FNO5·0.5CH3OH, contains two independent mol­ecules and a one methanol solvent mol­ecule. The methanol mol­ecule is O—H⋯O hydrogen bonded to one of the independent mol­ecules. The pyrrolidine rings in both mol­ecules adopt half-chair conformations, while the cyclo­pentane rings within the indane groups are in flattened envelope conformations, with the spiro C atoms forming the flaps. The benzene rings of the indane ring systems form a dihedral angle of 35.06 (7)° in one independent mol­ecule and 31.16 (8)° in the other. The fluoro-substituted benzene ring forms dihedral angles of 65.35 (6) and 85.87 (7)° with the indane group benzene rings in one mol­ecule, and 72.78 (8) and 77.27 (8)° in the other. In each mol­ecule, a weak intra­molecular C—H⋯O hydrogen bond forms an S(6) ring motif. In the crystal, weak C—H⋯O, C—H⋯N and C—H⋯F hydrogen bonds link the mol­ecules into a three-dimensional network.
doi:10.1107/S1600536813009987
PMCID: PMC3648276  PMID: 23723896
4.  5α-Hy­droxy­eudesm-4(15),11(13)-dien-8β,12-olide 
The title compound, C15H20O3, a sesquiterpene lactone, was isolated from the aerial parts of Carpesium minus Hemsl. (Compositae). The mol­ecule is composed of three rings, with the two cyclo­hexane rings in chair conformations and the cyclo­pentane ring adopting a twist conformation. The A/B ring junction is trans-fused. The absolute configuration shown has been arbitrarily assigned. In the crystal, mol­ecules are linked into [100] chains by O—H⋯O hydrogen bonds.
doi:10.1107/S1600536812012470
PMCID: PMC3344144  PMID: 22606147
5.  3β-Acet­oxy-19-hy­droxy-Δ5-pregnen-20-one 
In the title compound, C23H34O4, the C/D and D/E rings are trans fused and the A/B ring possesses an anti fusion. The two cyclo­hexane rings adopt a chair conformation while the cyclo­hexene ring exhibits a half-chair conformation. The cyclo­pentane ring displays an envelope conformation with the C atom bearing the methyl group as the flap. In the crystal, the mol­ecules are linked by O—H⋯O hydrogen bonds, forming chains along the b axis.
doi:10.1107/S1600536813002493
PMCID: PMC3569832  PMID: 23424578
6.  (20S)-Dammar-24-ene-3β,20-diol monohydrate from the bark of Aglaia exima (Meliaceae) 
In the title compound {systematic name: (1R,2R,5R,7R,10R,11R,14S,15R)-14-[(2S)-2-hy­droxy-6-methyl­hept-5-en-2-yl]-2,6,6,10,11-penta­methyl­tetra­cyclo­[8.7.0.02,7.011,15]hepta­decan-5-ol monohydrate}, C30H52O2·H2O, the three fused cyclo­hexane rings adopt chair conformations and the hy­droxy substituent of one of these occupies an axial position. The fused cyclo­pentane ring adopts an envelope conformation (with the flap atom being the C atom bearing the methyl group) and the 3-methyl­but-2-enyl portion of its substituent is disordered over three sets of sites in a 0.413 (7):0.250 (7):0.337 (7) ratio. The O atoms of both water mol­ecules occupy special positions of 2 site symmetry. In the crystal, Os—H⋯Ow and Ow—H⋯Os (s = steroid and w = water) hydrogen bonds link hy­droxy groups and water mol­ecules, forming a three-dimensional network. The crystal studied was found to be a non-merohedral twin with a 0.518 (1):0.482 (1) component ratio.
doi:10.1107/S1600536812034976
PMCID: PMC3435729  PMID: 22969600
7.  3-epi-Dammarenediol II 1.075 hydrate: a dammarane triterpene from the bark of Aglaia eximia  
The title dammarane tritepene, 3α,20(S)-dihy­droxy­dammar-24-ene, which crystallized out in a hydrated form, C30H52O2.1.075H2O, was isolated from the Aglaia eximia bark. The three cyclo­hexane rings adopt chair conformations. The cyclo­pentane has an envelope conformation with the quaternary C at position 14 as the flap atom with the maximum deviation of 0.288 (2) Å. The methyl­heptene side chain is disordered over two positions with 0.505 (1):0.495 (1) site occupancies and is axially attached with an (+)-syn-clinal conformation. The hydroxyl group at position 3 of dammarane is in a different conformation to the corresponding hydroxyl in Dammarenediol II. In the crystal, the dammarane and water mol­ecules are linked by ODammarane—H⋯Owater and Owater—H⋯ODammarane hydrogen bonds into a three-dimensional network.
doi:10.1107/S1600536812040366
PMCID: PMC3515193  PMID: 23284420
8.  (1S,3′S,3a′R,6′S)-6′-(2-Chloro­phen­yl)-3′-[(2R,3S)-1-(4-meth­oxy­phen­yl)-4-oxo-3-phenyl­azetidin-2-yl]-2-oxo-3′,3′a,4′,6′-tetra­hydro-2H,2′H-spiro­[ace­naphthyl­ene-1,1′-pyrrolo­[1,2-c][1,3]thia­zole]-2′,2′-dicarbo­nitrile 
The mol­ecular conformation of the title compound, C41H29ClN4O3S, is stabilized by intra­molecular C—H⋯O and C—H⋯Cl hydrogen bonds. The thia­zole ring adopts an envelope conformation with the N atom as the flap, while the pyrrolidine ring has a twisted conformation on the N—C bond involving the spiro C atom. The β la­ctam ring makes dihedral angles of 39.74 (15) and 16.21 (16)° with the mean planes of the thia­zole and pyrrolidine rings, respectively. The thia­zole ring mean plane makes dihedral angles of 23.79 (13) and 70.88 (13) ° with the pyrrolidine and cyclo­pentane rings, respectively, while the pyrrolidine ring makes a dihedral angle of 85.63 (13)° with the cyclo­pentane ring. The O atom attached to the β la­ctam ring deviates from its mean plane by 0.040 (2) Å, while the O atom attached to the cyclo­pentane ring deviates from its mean plane by 0.132 (2) Å. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds, forming chains along [010], and C—H⋯π and π-π inter­actions [centroid-centroid distance = 3.6928 (17) Å].
doi:10.1107/S1600536813009276
PMCID: PMC3648279  PMID: 23723899
9.  Lup-20(29)-en-28-ol-3-one (betulone) 
The asymmetric unit of the title compound, C30H48O2, contains two independent mol­ecules, the main difference between them being that the isopropenyl group is rotated by approximately 180°. In each mol­ecule, the fused six-membered rings have chair–chair–chair–chair conformations and the cyclo­pentane ring adopts an envelope conformation with the C atom bearing the hy­droxy­methyl group as the flap. All ring junctions are trans-fused. With the exception of one of the methyl groups adjacent to the C=O group, all the methyl groups are in axial positions. The isopropenyl group is equatorial and the hy­droxy­methyl group is in an axial orientation. In the crystal, weak C—H⋯O inter­actions link the mol­ecules into chains along [010]. Weak intra­molecular C—H⋯O hydrogen bonds are also observed but the hy­droxy groups are not involved in hydrogen bonds.
doi:10.1107/S1600536813011008
PMCID: PMC3648317  PMID: 23723937
10.  4′-(4-Bromo­phen­yl)-1′-methyl­dispiro­[acenaphthyl­ene-1,2′-pyrrolidine-3′,2′′-indane]-2,1′′(1H)-dione 
In the title compound, C30H22BrNO2, the cyclo­pentane ring of the dihydro­acenaphthyl­ene group and the pyrrolidine ring are both in envelope conformations with the spiro C atom and N atom, respectively, as the flap atom. The cyclo­pentane ring of the indane group adopts a half-chair conformation. A weak intra­molecular C—H⋯O hydrogen bond forms an S(8) ring motif. The naphthalene ring system of the dihydro­acenaphthyl­ene group forms dihedral angles of 41.76 (6) and 42.17 (6)° with the benzene ring of the bromo­phenyl group and the benzene ring of the indane group, respectively. The dihedral angle between the two benzene rings is 83.92 (7)°. In the crystal, mol­ecules are linked by weak C—H⋯O and C—H⋯N hydrogen bonds into a two-dimensional network parallel to the ac plane. Weak C—H⋯π inter­actions are also observed.
doi:10.1107/S1600536812014213
PMCID: PMC3344476  PMID: 22590238
11.  4-Amino-8-cyclo­pent­yloxy-7-meth­oxy-2H-chromen-2-one monohydrate 
The asymmetric unit of the title compound, C15H17NO4·H2O, contains two organic mol­ecules with marginal differences between them and two water molecules. The chromine rings in both mol­ecules are essentially planar, with maximum deviations of 0.012 (2) and 0.060 (2) Å. The five-membered cyclo­pentane rings adopt envelope conformations in both mol­ecules. In the crystal, the components are linked by N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds, resulting in a three-dimensional network.
doi:10.1107/S160053681201450X
PMCID: PMC3344523  PMID: 22590285
12.  2,2′-[(E,E)-cis-(Cyclo­hexane-1,4-di­yl)bis­(nitrilo­methanylyl­idene)]diphenol 
In the title compound, C20H22N2O2, the asymmetric unit contains two independent half-mol­ecules, which are both completed by crystallographic inversion symmetry. The cyclo­hexane rings of both mol­ecules adopt chair conformations; the N atoms are in equatorial orientations in one mol­ecule and in axial orientations in the other. Both mol­ecules feature two intra­molecular O—H⋯N hydrogen bonds, which generate S(6) rings.
doi:10.1107/S1600536812023367
PMCID: PMC3379462  PMID: 22719660
13.  Ethyl 2-[2-(2,4-diphenyl-3-aza­bicyclo­[3.3.1]nonan-9-yl­idene)hydrazin-1-yl]-4-methyl-1,3-thia­zole-5-carboxyl­ate di­methyl­formamide monosolvate 
In the title mol­ecule, C27H30N4O2S·C3H7NO, the fused piperidine and cyclo­hexane rings adopt a twin chair conformation and the phenyl groups occupy equatorial sites. The phenyl rings make a dihedral angle of 40.74 (2)°. In the crystal, the di­methyl­formamide solvent mol­ecule is connected to the main mol­ecule by an N—H⋯O hydrogen bond. An additional N—H⋯O hydrogen bond connects mol­ecules into chains along [100]. Pairs of weak C—H⋯O hydrogen bonds connect inversion-related chains. The ethyl group was refined as disordered over two sets of sites with an occupancy ratio of 0.660 (17):0.340 (17).
doi:10.1107/S1600536813033540
PMCID: PMC3914099  PMID: 24527004
14.  (4-Meth­oxy­phen­yl)(4-propyl­cyclo­hex­yl)methanone 
The asymmetric unit of the title compound, C17H24O2, contains two independent mol­ecules with different conformations. The least-squares plane through the cyclohexane ring makes dihedral angles of 52.9 (5) and 81.4 (4)° with the benzene ring in the two molecules. The cyclo­hexane ring adopts a chair conformation in both mol­ecules. In the crystal, weak C—H⋯O hydrogen bonds link mol­ecules related by translation in [100] into two crystallographically independent chains.
doi:10.1107/S1600536813003644
PMCID: PMC3588551  PMID: 23476585
15.  ent-(15S)-Pimar-8(14)-ene-15,16-diol 
The title compound {systematic name: (S)-1-[(2S,4aR,8aR)-2,4b,8,8-tetra­methyl-2,3,4,4a,4b,5,6,7,8,8a,9,10-dodeca­hydro­phenanthren-2-yl]ethane-1,2-diol}, C20H34O2, is an ent-pimarane diterpenoid which was isolated from the stem bark of Ceriops tagal. In the asymmetric unit, there are two crystallographically independent mol­ecules, which are conformationally almost identical. In each mol­ecule, the two cyclo­hexane rings of the fused three-ring system adopt chair conformations, while the cyclo­hexene ring is in an envelope conformation, with the methylene C atom next to the side chain as the flap atom. In the crystal, mol­ecules are stacked in columns along the b axis through O—H⋯O hydrogen bonds.
doi:10.1107/S1600536812002565
PMCID: PMC3275262  PMID: 22347118
16.  (2S,3R,4S,4aR)-2,3,4,7-Tetra­hydroxy-3,4,4a,5-tetra­hydro­[1,3]dioxolo[4,5-j]phenanthridin-6(2H)-one hemihydrate 
The title natural compound, isolated from Narcissus pseudonarcissus var. King Alfred crystallizes as a hemihydrate, C14H13NO7·0.5H2O, with four crystallographically independent dioxolophenanthridinone mol­ecules and two crystallographically independent solvent water mol­ecules in the asymmetric unit. All four crystallographically independent dioxolophenanthridinone mol­ecules are geometrically very similar and differ only in the orientations of the three hy­droxy groups at the terminal cyclo­hexene rings. The five-membered dioxolane ring has a planar conformation (the r.m.s. deviations are 0.010, 0.019, 0.025 and 0.004 Å, for the four crystallographically independent molecules), and the six-membered dihydro­pyridone and cyclo­hexene rings adopt sofa conformations in each mol­ecule. The flattened structure of each dioxolophenanthridinone mol­ecule is supported by a strong intra­molecular O—H⋯O hydrogen bond. The N atom has a slightly pyramidalized configuration. In the crystal, the dioxolophenanthridinone mol­ecules form layers parallel to (101) with O—H⋯O and N—H⋯O hydrogen bonds linking the dioxolophenanthridinone mol­ecules both within and between the layers and the water mol­ecules, forming a three-dimensional framework. The absolute configurations of the chiral centers are 2S, 3R, 4S and 4aR.
doi:10.1107/S1600536812048763
PMCID: PMC3588326  PMID: 23476470
17.  2-Cyclo­pentyl­idenehydrazine­carboxamide 
The asymmetric unit of the title compound, C6H11N3O, consists of two independent mol­ecules in which the cyclo­pentane rings adopt envelope conformations with CH2 grouping as the flap and the semicarbazone groups are essentially planar, with maximums deviation of 0.0311 (12) and 0.0285 (12) Å. In the crystal, N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds link the mol­ecules to form sheets lying parallel to the ab plane.
doi:10.1107/S1600536812034599
PMCID: PMC3435698  PMID: 22969569
18.  {2-[(1H-Indol-3-yl­methyl­idene)amino]-4,5,6,7-tetra­hydro­benzo[b]thio­phen-3-yl}(phen­yl)methanone 
The title compound, C24H20N2OS, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit, in each of which the cyclo­hexene rings adopt half-chair conformations. The mean plane of the indole ring is twisted from those of the phenyl and thio­phene rings by 69.0 (7) and 8.3 (5)°, respectively, in mol­ecule A and by 65.4 (9) and 6.7 (5)°, respectively, in mol­ecule B. The dihedral angles between the mean planes of the phenyl and thio­phene rings are 63.0 (4) and 58.8 (9)° in mol­ecules A and B, respectively. In the crystal, N—H⋯O hydrogen bonds lead to the formation of an infinite chain along [101]. In addition, π–π stacking inter­actions are observed involving the thio­phene and pyrrole rings of the two mol­ecules, with a shortest inter­centroid distance of 3.468 (2) Å.
doi:10.1107/S1600536814006345
PMCID: PMC3998588  PMID: 24826189
19.  N-[3a-(4-Bromo­phen­yl)-8b-hy­droxy-6,8-dimeth­oxy-3-phenyl-2,3,3a,8b-tetra­hydro-1H-cyclo­penta­[b]benzofuran-1-yl]formamide monohydrate 
In the title compound, C26H24BrNO5·H2O, a synthetic analogue of natural flavagline, the cyclo­pentane ring adopts an envelope conformation (the flap atom bearing the phenyl group) and the vicinal phenyl and bromo­phenyl groups are slightly shifted relative to each other [CPh—C—C—CPhBr = 36.3 (2)°]. Intra­molecular N—H⋯O and C—H⋯O hydrogen bonds form S(5) motifs. In the crystal, the organic and the water mol­ecules are linked by an O—H⋯O hydrogen bond. Pairs of organic and water mol­ecules, located about inversion centers, inter­act through O—H⋯O hydrogen bonds, forming R 4 4(20) and R 4 4(26) motifs, which together lead to C 2 2(9) motifs. The crystal packing is also characterized by N—H⋯O and C—H⋯O hydrogen bonds between neighbouring organic mol­ecules, forming R 2 2(10) and R 2 2(18) motifs, respectively.
doi:10.1107/S1600536812049641
PMCID: PMC3588239  PMID: 23476436
20.  17βH-Periplogenin, a cardiac aglycone from the root bark of Periploca sepium Bunge 
The title compound {systematic name: 4-[(3S,5S,8R,9S,10R,13R,14S,17S)-3,5,14-trihy­droxy-10,13-dimethyl­hexa­deca­hydro-1H-cyclo­penta­[a]phenanthren-17-yl]furan-2(5H)-one}, C23H34O5, was isolated from the roots of Periploca sepium Bunge, a famous Chinese traditional herbal medicine. The three six-membered rings adopt chair conformations, the cyclo­pentane ring displays an approximate envelope conformation (with the C atom bearing the methyl substituent at the flap) and the five-membered lactone ring adopts an essentially planar [maximum deviation of 0.004 (8) Å] conformation. In the crystal, mol­ecules are linked into helical chains along [010] by O—H⋯O hydrogen bonds and weak C—H⋯O inter­actions. Two intra­molecular O—H⋯O hydrogen bonds are also present.
doi:10.1107/S1600536812018521
PMCID: PMC3379196  PMID: 22719394
21.  7′-Phenyl-1′,3′,5′,6′,7′,7a’-hexa­hydro­dipiro[acenaphthyl­ene-1,5′-pyrrolo­[1,2-c]thia­zole-6′,2′′-indane]-2,1′′(1H)-dione 
In the title compound, C31H23NO2S, the pyrrolidine ring adopts an envelope conformation (with the spiro C atom as the flap), while the thia­zolidine ring and the two cyclo­pentane rings adopt twisted conformations. The mean plane through the hexa­hydro­pyrrolo­[1,2-c]thia­zole ring [r.m.s deviation = 0.400 (1) Å] forms dihedral angles of 76.83 (4), 80.70 (5) and 79.00 (4)° with the benzene ring and the mean planes of the dihydro­acenaphthyl­ene and the dihydro­indene rings, respectively. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into sheets lying parallel to the bc plane. One of the ketone O atoms accepts three such bonds. Weak C—H⋯π inter­actions are also observed.
doi:10.1107/S1600536812013293
PMCID: PMC3344191  PMID: 22606194
22.  7-Iodo-3,3-diphenyl­octa­hydro­benzo­furan 
The title compound, C20H21IO, was synthesized by cyclo­haloetherification of 2-(cyclo­hex-2-en­yl)-2,2-diphenyl­ethanol in CH2Cl2, and crystallized with two independent mol­ecules in the asymmetric unit. The six-membered cyclo­hexane ring adopts a chair conformation, while the five-membered ring adopts an envelope conformation with the fused C atom opposite the O atom as the flap in each case [displacements of the flap atoms = 0.6813 (3) and 0.6679 (3) Å]. In the crystal, mol­ecules are linked via pairs of C—H⋯π inter­actions, forming inversion dimers.
doi:10.1107/S1600536813007563
PMCID: PMC3629630  PMID: 23634117
23.  6-Ferrocenoyl-7-phenyl­spiro­[hexa­hydro­pyrrolo­[1,2-c][1,3]thia­zole-5,11′-indeno­[1,2-b]quinoxaline] 
In the title compound, [Fe(C5H5)(C32H24N3OS)], both the thia­zolidine ring and the pyrrolidine ring adopt an envelope conformation, with the S atom and the phenyl-bearing C atom, respectively, as the flaps. The thia­zolidine ring mean plane makes a dihedral angle of 59.08 (11)° with the pyrrolidine ring mean plane, which in turn makes a dihedral angle of 83.40 (10)° with the cyclo­pentane ring, indicating that the latter two rings are almost orthogonal to one another. In the crystal, a pair of C—H⋯O hydrogen bonds link the mol­ecules forming inversion dimers. The dimers are linked via π–π inter­actions [centroid–centroid distance = 3.7764 (10) Å] involving the quinoxaline moieties forming chains propagating along [1-10].
doi:10.1107/S1600536813022605
PMCID: PMC3884422  PMID: 24426995
24.  Tris(η5-cyclo­penta­dien­yl)-tris­[η6-[9,10-dihydro­anthracene-9,10-endo-3′,4′-(N-benz­yl)pyrrolidine]]triruthenium(II) tris­(hexa­fluoro­phosphate) acetone disolvate 
In the title compound, [Ru3(C25H23N)(C5H5)3]·3PF6·2C3H6O], the cation is a triruthenium complex of a 9,10-dihydro­anthracene derivative. Three RuCp+ (Cp is cyclo­penta­dien­yl) groups are bonded to the three aromatic rings of the ligand. Surprisingly, the pyramidalized N atom of the heterocycle (Σ C—N—C = 329.0°) points towards the anthracenyl group, so losing its coordinative ability. There is an inter­molecular C—H⋯π inter­action involving an acetone mol­ecule and the adjacent benzyl ring of the ligand. In the crystal, mol­ecules are linked via a number of C—H⋯O and C—H⋯F inter­actions and a C—H⋯π inter­action, leading to the formation of a three-dimensional supra­molecular structure. One of the Cp groups is disordered over two positions, with refined occupancies of 0.695 (14):0.305 (14). Two of the three hexa­fluoro­phospate anions are disordered, with refined occupancies of 0.630 (6):0.370 (6) and 0.771 (8):0.229 (8). One of the two solvent acetone mol­ecules is also disordered, with refined occupancies of 0.82 (2):0.18 (2).
doi:10.1107/S1600536812040652
PMCID: PMC3470180  PMID: 23125624
25.  14,15-Didehydro­hellebrigenin 
The title compound, C24H30O5, is the didehydro product of the steroid hellebrigenin (systematic name: 3β,5,14-trihy­droxy-19-oxo-5β-bufa-20,22-dienolide). It consists of three cyclo­hexane rings (A, B and C), a five-membered ring (D) and a six-membered lactone ring (E). The stereochemistry of the ring junctions are A/B cis, B/C trans and C/D cis. Cyclo­hexane rings A, B and C have normal chair conformations. The five-membered ring D with the C=C bond adopts an envelope conformation. Lactone ring E is essentially planar with a mean derivation of 0.006 (4) Å and is β-oriented at the C atom of ring D to which it is attached. There is an O—H⋯O hydrogen bond in the mol­ecule involving the hy­droxy groups. In the crystal, O—H⋯O hydrogen bonds link the mol­ecules into chains propagating along [010]. The chains are linked by C—H⋯O contacts into a three-dimensional network.
doi:10.1107/S1600536812018570
PMCID: PMC3379221  PMID: 22719419

Results 1-25 (425680)