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1.  Ethyl 2-(1,3-benzodioxol-5-yl)-1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-1H-benz­imidazole-5-carboxyl­ate 
In the title compound, C24H25N3O5, the benzimidazole and benzodioxole ring systems are each approximately planar [maximum deviations = 0.043 (1) and 0.036 (1) Å, respectively]. Their mean planes form a dihedral angle of 42.85 (4)°. The pyrrolidine ring has an envelope conformation with one of the methyl­ene C atoms forming the flap. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. The crystal packing is further stabillized by weak π–π inter­actions between the benzene rings within the benzimidazole ring system [centroid–centroid distance = 3.7955 (7) Å]. A weak C—H⋯π inter­action involving the benzodioxole ring is also present.
doi:10.1107/S1600536812001420
PMCID: PMC3275223  PMID: 22347079
2.  Ethyl 1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-2-phenyl-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C23H25N3O3, the benzimidazole ring system is essentially planar [maximum deviation = 0.0240 (18) Å]. The mean plane through this ring system forms a dihedral angle of 42.23 (7)° with the benzene ring. The pyrrolidine ring is in an envelope conformation with the flap atom disordered over two sites with occupancies of 0.813 (11) and 0.187 (11). In the crystal, weak C—H⋯O hydrogen bonds form R 2 2(10) ring motifs, which are connected by further C—H⋯O inter­actions, forming ribbons along the b axis. The crystal structure is further stabilized by weak π–π inter­actions involving the imidazole and benzene rings of the benzimidazole ring system [centroid–centroid distances = 3.6788 (11) and 3.6316 (10) Å] and weak C—H⋯π inter­actions.
doi:10.1107/S1600536811054833
PMCID: PMC3274946  PMID: 22346899
3.  Ethyl 2-(4-meth­oxy­phen­yl)-1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-1H-benzimidazole-5-carboxyl­ate 
The asymmetric unit of the title compound, C24H27N3O4, contains two mol­ecules, A and B. The benzimidazole rings are essentially planar [maximum deviations = 0.0144 (10) and 0.0311 (8) Å in A and B, respectively]. The dihedral angle between the benzimidazole mean plane and its attached benzene ring is 36.90 (5) ° for mol­ecule A and 51.40 (5) ° for mol­ecule B. In both mol­ecules, the pyrrolidine ring adopts an envelope conformation with a C atom as the flap. In molecule B, the flap C atom is disordered over two positions in a 0.711 (6):0.289 (6) ratio. In the crystal, C—H⋯O inter­actions link the mol­ecules, generating [100] chains. The crystal packing also features weak π–π inter­actions between the imidazole and benzene rings [centroid–centroid distances = 3.8007 (7) and 3.8086 (7) Å] and between the benzene rings [centroid–centroid distance = 3.7001 (7) Å] and C—H⋯π inter­actions involving the benzene rings.
doi:10.1107/S1600536811055966
PMCID: PMC3275001  PMID: 22346946
4.  Ethyl 2-(4-hy­droxy-3-meth­oxy­phen­yl)-1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-1H-benzimidazole-5-carboxyl­ate monohydrate 
In the title compound, C24H27N3O5·H2O, the essentially planar benzimidazole ring system [maximum deviation = 0.020 (1) Å] forms dihedral angles of 54.10 (11) and 67.79 (6)°, respectively, with the mean plane of pyrrolidin-2-one ring and the benzene ring. The pyrrolidin-2-one ring adopts an envelope conformation with one of the methylene C atoms at the flap. An intra­molecular C—H⋯π inter­action is observed. In the crystal, O—H⋯O and O—H⋯N hydrogen bonds link the two components into a double-tape structure along the a axis. The crystal packing is further stabilized by weak π–π stacking [centroid–centroid distance = 3.6632 (9) Å] and C—H⋯O inter­actions.
doi:10.1107/S1600536811052391
PMCID: PMC3254439  PMID: 22259586
5.  1-(Prop-2-en-1-yl)-3-[(trimethyl­sil­yl)meth­yl]benzimidazolium bromide monohydrate 
In the title compound, C14H21N2Si+·Br−·H2O, the benzimidazole ring system is almost planar [maximum deviation = 0.021 (2) Å]. In the crystal, O—H⋯Br and C—H⋯O hydrogen bonds link the ions via the O atoms of the water mol­ecules. In addition, there are π–π stacking inter­actions between the centroids of the benzene and imidazole rings of the benzimidazole ring system [centroid–centroid distances = 3.521 (3) and 3.575 (2) Å].
doi:10.1107/S1600536810033015
PMCID: PMC3008061  PMID: 21588727
6.  Ethyl 2-[5-(4-fluoro­phen­yl)pyridin-3-yl]-1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C28H27FN4O3·H2O, the benzimidazole ring system is essentially planar with a maximum deviation of 0.028 (1) Å. It makes dihedral angles of 47.59 (5) and 60.31 (5)°, respectively, with the pyridine and benzene rings, which make a dihedral angle of 22.58 (6)° with each other. The pyrrolidine ring shows an envelope conformation with one of the methyl­ene C atoms as the flap. In the crystal, the components are connected into a tape along the b-axis direction through O—H⋯O and O—H⋯N hydrogen bonds and a π–π inter­action between the pyridine and benzene rings [centroid–centroid distance of 3.685 (8) Å]. The tapes are further linked into layers parallel to the ab plane by C—H⋯O and C—H⋯F inter­actions.
doi:10.1107/S1600536813014177
PMCID: PMC3772454  PMID: 24046597
7.  Ethyl 2-(4-nitro­phen­yl)-1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C23H24N4O5, the essentially planar benzimidazole ring system [maximum deviation = 0.008 (2) Å] forms a dihedral angle of 39.22 (7)° with the attached nitro­benzene ring. The pyrrolidin-2-one ring adopts an envelope conformation with a C atom as the flap. In the crystal, mol­ecules are connected by C—H⋯O inter­actions, forming sheets propagating in (011). The crystal packing also features weak π–π stacking inter­actions [centroid–centroid = 3.6746 (12) Å].
doi:10.1107/S1600536811052408
PMCID: PMC3254415  PMID: 22259559
8.  2-Methyl-6-(6-methyl-1H-benzimidazol-2-yl)phenol–2-methyl-6-(5-methyl-1H-benzimidazol-2-yl)phenol (3/1) 
The title compound, 0.75C15H14N2O·0.25C15H14N2O, is a co-crystal of 2-methyl-6-(6-methyl-1H-benzimidazol-2-yl)phenol as the major component and 2-methyl-6-(5-methyl-1H-benz­imidazol-2-yl)phenol as the minor component. The refined site-occupancy ratio is 0.746 (4)/0.254 (4). The conformations of both components are identical except for that of the methyl substituent on the benzene ring of the benzimidazole unit which is positionally disordered over two positions. The mol­ecule is essentially planar, the dihedral angle between the benzimidazole plane and the benzene ring being 3.49 (4)°. An intra­molecular O—H⋯N hydrogen bond generates an S(6) ring motif. In the crystal packing, mol­ecules are linked through N—H⋯O hydrogen bonds into chains along [201]. These chains are stacked approximately along the a-axis direction. The crystal packing is further stabilized by weak N—H⋯O and O⋯H⋯N hydrogen bonds, together with weak inter­molecular C—H⋯π inter­actions. A π–π inter­action with a centroid–centroid distance of 3.6241 (6) Å is also observed between the substituted phenyl ring and that of the benzimidazole system.
doi:10.1107/S1600536809049770
PMCID: PMC2972110  PMID: 21578934
9.  Crystal structure of azilsartan methyl ester ethyl acetate hemisolvate 
The title compound, C26H22N4O5 (systematic name: methyl 2-eth­oxy-1-{4-[2-(5-oxo-4,5-di­hydro-1,2,4-oxa­diazol-3-yl)phenyl]benz­yl}-1H-1,3-benzo­diazole-7-carboxyl­ate ethyl acetate hemisolvate), was obtained via cyclization of methyl (Z)-2-eth­oxy-1-{(2′-(N′-hy­droxy­carbamimido­yl)-[1,1′-biphen­yl]-4-yl)meth­yl}-1H-benzo[d]imidazole-7-carboxyl­ate with diphen­yl carbonate. There are two independent mol­ecules (A and B) with different conformations and an ethyl acetate solvent mol­ecule in the asymmetric unit. In mol­ecule A, the dihedral angle between the benzene ring and its attached oxa­diazole ring is 59.36 (17); the dihedral angle between the benzene rings is 43.89 (15) and that between the benzene ring and its attached imidazole ring system is 80.06 (11)°. The corres­ponding dihedral angles in mol­ecule B are 58.45 (18), 50.73 (16) and 85.37 (10)°, respectively. The C—O—C—Cm (m = meth­yl) torsion angles for the eth­oxy side chains attached to the imidazole rings in mol­ecules A and B are 93.9 (3) and −174.6 (3)°, respectively. In the crystal, the components are linked by N—H⋯N and C—H⋯O hydrogen bonds, generating a three-dimensional network. Aromatic π–π stacking inter­actions [shortest centroid–centroid separation = 3.536 (3)Å] are also observed.
doi:10.1107/S2056989014028023
PMCID: PMC4384622  PMID: 25878884
crystal structure; azilsartan; azilsartan methyl ester; anti­hypertension
10.  2-(4-Chloro­phen­yl)-4,5-diphenyl-1-(prop-2-en-1-yl)-1H-imidazole 
The title compound, C24H19ClN2, crystallizes with two independent mol­ecules in the asymmetric unit. The prop-2-enyl substituents on the imidazole rings adopt similar conformations in the two mol­ecules. The 4-and 5-substituted phenyl rings and the benzene ring make dihedral angles of 67.06 (8), 5.61 (8) and 41.09 (8)°, respectively, with the imadazole ring in one mol­ecule and 71.53 (8), 28.85 (8) and 41.87 (8)°, respectively, in the other. The crystal structure features C—H⋯π inter­actions and weak π–π stacking inter­actions [centroid–centroid distances = 3.6937 (10) and 4.0232 (10) Å] between the chloro­phenyl rings, which form a three-dimensional supramolecular structure.
doi:10.1107/S1600536813012592
PMCID: PMC3685034  PMID: 23795053
11.  4-[(E)-2,6-Dichloro­benzyl­ideneamino]-3-{1-[4-(2-methyl­prop­yl)phen­yl]eth­yl}-1H-1,2,4-triazole-5(4H)-thione 
In the title Schiff base compound, C21H22Cl2N4S, the triazole ring makes dihedral angles of 2.15 (11) and 87.48 (11)° with the 2,6-dichloro­phenyl and methyl­propyl­phenyl rings, respectively. Weak intra­molecular C—H⋯S and C—H⋯Cl inter­actions generate S(6) and S(5) ring motifs, respectively. In the crystal structure, centrosymmetrically related mol­ecules are linked into dimers by N—H⋯S hydrogen bonds. These dimers are arranged into sheets parallel to the ab plane and are stacked along the c axis. C—H⋯π inter­actions involving the methyl­propyl­phenyl ring and π–π inter­actions involving the dichloro­phenyl ring [centroid–centroid distance = 3.5865 (3) Å] are also observed.
doi:10.1107/S1600536808021272
PMCID: PMC2962131  PMID: 21203213
12.  Crystal structure of 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)meth­yl]-2-(thia­zol-4-yl)-1H-benzimidazole 
The benzimidazole ring in the title compound, C16H17N3O2S, is almost planar, with the greatest deviation from the mean plane being 0.032 (1) Å. The fused-ring system makes dihedral angles of 19.91 (7) and 24.51 (8)° with the best plane through each of the thia­zol-4-yl and 1,3-dioxolan-4-yl rings, respectively; the latter exhibits an envelope conformation with the methyl­ene C atom being the flap. Finally, the thia­zol-4-yl ring makes a dihedral angle of 33.85 (9)° with the 1,3-dioxolan-4-yl ring. In the crystal, mol­ecules are connected by a pair of C—H⋯π(imidazole) inter­actions to form centrosymmetric aggregates.
doi:10.1107/S205698901502085X
PMCID: PMC4719918  PMID: 26870546
crystal structure; benzimidazole; thia­zol-4-yl; 1,3-dioxolan-4-yl
13.  1-(3-Bromo­prop­yl)-4-(2-pyrid­yl)-1H-1,2,3-triazole 
In the structure of the title compound, C10H11BrN4, the plane of the substituted 1,2,3-triazole ring is tilted by 14.84 (10)° with respect to the mean plane of the pyridine ring. The pyridine and closest triazole N atoms adopt an anti arrangement which removes any lone pair–lone pair repulsions between the N atoms. This conformation is further stabilized by weak intermolecular C—H⋯N inter­actions. There are two mol­ecules in the unit cell, which form a centrosymmetric head-to-tail dimer. The dimers are stabilized through π–π inter­actions [centroid–centroid distance = 3.733 (4) Å and mean inter­planar distance = 3.806 (12) Å] between the substituted 1,2,3-triazole ring and the pyridine rings in adjacent mol­ecules. Each dimer inter­acts with two neighbouring dimers above and below, forming a slipped stack of dimers through the crystal. The 3-bromo­propyl chain sits over the pyridine ring of a neighbouring mol­ecule and the triazole rings of nearby mol­ecules are adjacent.
doi:10.1107/S1600536809012148
PMCID: PMC2977690  PMID: 21584033
14.  Prop-2-en-1-yl 4-(4,5-diphenyl-1H-imidazol-2-yl)benzoate 
The title compound, C25H20N2O2, crystallized with two mol­ecules in the asymmetric unit, in one of which the atoms of the terminal propenyl group are disordered over two sets of sites, with a refined occupancy ratio of 0.870 (4):0.130 (4). The central imidazole ring makes dihedral angles of 25.51 (11), 40.73 (11) and 27.36 (11)° with the three pendant rings in one molecule and 22.56 (10), 60.72 (10) and 5.85 (10)° in the other. In the crystal, mol­ecules are linked by N—H⋯N and C—H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure also features C—H⋯π inter­actions and π–π stacking [centroid–centroid distances = 3.8834 (18) and 3.9621 (17) Å] inter­actions.
doi:10.1107/S160053681301619X
PMCID: PMC3770380  PMID: 24046665
15.  2-Meth­oxy-6-(6-methyl-1H-benzimid­azol-2-yl)phenol 
In the title mol­ecule, C15H14N2O2, the substituted benzene ring forms a dihedral angle of 4.15 (1)° with the benzimidazole ring system. An intra­molecular O—H⋯N hydrogen bond generates an S(6) ring motif. In the solid state, mol­ecules are linked into chains along the [001] via inter­molecular bifurcated N—H⋯(O,O) hydrogen bonds, which generate R 1 2(5) ring motifs. The crystal packing is also consolidated by C—H⋯π inter­actions, and π–π stacking inter­actions between the imidazole and substituted benzene rings [centroid–centroid distance = 3.5746 (13) Å]. The methyl group attached to the benzimidazole ring system is disordered over two positions with occupancies of 0.587 (6) and 0.413 (6), suggesting 180° rotational disorder for the benzimidazole group.
doi:10.1107/S1600536809022478
PMCID: PMC2969490  PMID: 21582885
16.  1,3-Bis(3-phenyl­prop­yl)benzimidazolium bromide monohydrate 
In the title compound, C25H27N2 +·Br−·H2O, the benzimidazole unit is essentially planar, with a maximum deviation of 0.020 (6) Å. The benzimidazole unit makes dihedral angles of 83.6 (3) and 81.0 (3)° with the two terminal phenyl rings. The dihedral angle between the phenyl rings is 58.5 (4)°. In the crystal structure, there are C—H⋯O hydrogen bonds, a C—H⋯π inter­action between a phenyl H atom and the phenyl ring of a neighbouring mol­ecule, and a π–π inter­action [3.512 (3) Å] between the centroids of the five-membered ring and the benzene ring of the benzimidazole unit of an adjacent mol­ecule.
doi:10.1107/S1600536808030432
PMCID: PMC2959260  PMID: 21201214
17.  1-[4-(Prop-2-en-1-yl­oxy)benz­yl]-2-[4-(prop-2-en-1-yl­oxy)phen­yl]-1H-benzimidazole 
In the title compound, C26H24N2O2, the benzimidazole ring system is almost planar [maximum displacement = 0.025 (1) Å] and makes dihedral angles of 80.48 (5) and 41.57 (5)° with the benzene rings, which are inclined to one another by 65.33 (6)°. In the crystal, mol­ecules are linked via C—H⋯π and weak π–π inter­actions [centroid–centroid distance = 3.8070 (7) Å and inter­planar distance = 3.6160 (5) Å].
doi:10.1107/S160053681204559X
PMCID: PMC3588921  PMID: 23476157
18.  1-(1H-Benzimidazol-1-ylmeth­yl)-3-[2-(di­isopropyl­amino)eth­yl]-1H-benzimid­azolium bromide 0.25-hydrate 
The title N-heterocyclic carbene derivative, C23H30N5 +·Br−·0.25H2O, was synthesized using microwave heating and was characterized by 1H and 13C NMR spectroscopy and a single-crystal X-ray diffraction study. The structure of the title compound are stabilized by a network of intra- and inter­molecular C—H⋯Br hydrogen-bonding inter­actions. The crystal structure is further stabilized by π–π stacking inter­actions between benzene and imidazole fragment rings of parallel benzo[d]imidazole rings, with a separation of 3.486 (3) Å between the centroids of the benzene and imidazole rings. There is also an inter­molecular C—H⋯π inter­action in the crystal structure. The C—N bond lengths for the central benzimidazole ring are shorter than the average single C—N bond, thus showing varying degrees of double-bond character and indicating partial electron delocalization within the C—N—C—N—C fragment. The isopropyl group is disordered over two sites with occupancies of 0.792 (10) and 0.208 (10).
doi:10.1107/S160053680900765X
PMCID: PMC2969106  PMID: 21582439
19.  (Z)-3-(9-Anthr­yl)-1-(4-bromo­phen­yl)-2-(4-nitro-1H-imidazol-1-yl)prop-2-en-1-one 
In the title mol­ecule, C26H16BrN3O3, the anthracene and benzene mean planes make dihedral angles of 63.79 (2) and 14.67 (2)°, respectively, with the plane of the imidazole ring. In the crystal structure, weak inter­molecular C—H⋯O hydrogen bonds link mol­ecules to form centrosymmetric dimers. Weak π–π stacking inter­actions, with centroid–centroid distances of 3.779 (2) and 3.826 (2) Å, supply additional stabilization. The crystal packing also exhibits short inter­molecular contacts between the nitro groups and Br atoms [Br⋯O = 3.114 (2) Å].
doi:10.1107/S1600536809018352
PMCID: PMC2969633  PMID: 21583241
20.  2-(2-Methyl-5-nitro-1H-imidazol-1-yl)ethyl 2-nitro­benzoate 
In the title compound, C13H12N4O6, the mean plane through the nitro­benzene forms a dihedral angle of 37.38 (15)° with the plane through the imidazole ring. The crystal packing is stabilized by weak inter­molecular C—H⋯O and C—H⋯N inter­actions together with π–π stacking inter­actions between nitro­benzene rings [centroid–centroid distance = 3.788 (3) Å] and between imidazole rings [centroid–centroid distance = 3.590 (2) Å].
doi:10.1107/S1600536810004186
PMCID: PMC2983685  PMID: 21580319
21.  (E)-3-(6-Nitro­benzo[d][1,3]dioxol-5-yl)-1-(2,4,6-trimethoxy­phen­yl)prop-2-en-1-one 
In the mol­ecule of the title compound, C19H17NO8, the benzodioxole unit is oriented at a dihedral angle of 61.45 (6)° with respect to the meth­oxy-substituted phenyl ring. The nitro group is not co-planar to the benzene ring to which it is attached, making a dihedral angle of 31.86 (17)°. In the crystal structure, inter­molecular C—H⋯O inter­actions link the mol­ecules into chains through R 2 2(8) ring motifs. The π⋯π contacts between the benzodioxole rings, [centroid–centroid distances = 3.7610 (9), 3.6613 (9) and 3.7975 (9) Å] may further stabilize the structure.
doi:10.1107/S1600536809036435
PMCID: PMC2970272  PMID: 21577987
22.  6-[3-(p-Tolyl­sulfonyl­amino)­prop­yl]diquino­thia­zine1  
In the title mol­ecule {systematic name: N-[3-(diquino[3,2-b;2′,3′-e][1,4]thia­zin-6-yl)prop­yl]-4-methyl­benzene­sulfon­amide}, C28H24N4O2S2, the penta­cyclic system is relatively planar [maximum deviation from the mean plane = 0.242 (1) Å]. The dihedral angle between two quinoline ring systems is 8.23 (2)° and that between the two halves of the 1,4-thia­zine ring is 5.68 (3)°. The conformation adopted by the 3-(p-tolyl­sulfonyl­amino)­propyl substituent allows for the formation of an intra­molecular N—H⋯N hydrogen bond and places the benzene ring of this substituent above one of the quinoline fragments of the penta­cyclic system. In the crystal, mol­ecules are arranged via π–π stacking inter­actions into (0-11) layers [centroid–centroid distances = 3.981 (1)–4.320 (1) Å for the rings in the penta­cyclic system and 3.645 (1) Å for the tolyl benzene rings]. In addition, mol­ecules are involved in weak C—H⋯O, which connect the layers, and C—H⋯S hydrogen bonds. The title compound shows promising anti­cancer activity against renal cancer cell line UO-31.
doi:10.1107/S1600536813013950
PMCID: PMC3685109  PMID: 23795128
23.  1,3-Bis(3-phenyl­prop­yl)-1H-benzimidazol-3-ium-2-carbodithio­ate 
The title compound, C26H26N2S2, was synthesized from bis­[1,3-bis­(3-phenyl­prop­yl)benzimidazolidine-2-yl­idene] and CS2 in toluene. The mol­ecular structure is composed of a benzimidazole ring system with two phenyl­propyl substituents and a dithio­carboxyl­ate group in the 2-position. The benzimidazole unit is essentially planar, with a maximum atomic deviation of 0.008 (2) Å, and makes dihedral angles of 72.72 (10) and 27.62 (12)°, with the two phenyl rings. The dihedral angle between the two phenyl rings is 55.98 (15)°. The mol­ecular packing is stabilized by a C—H⋯S inter­molecular hydrogen-bonding inter­action and a C—H⋯π inter­action between a benzene H atom and the phenyl ring of a neighbouring mol­ecule.
doi:10.1107/S1600536808042761
PMCID: PMC2968085  PMID: 21581631
24.  3-Meth­oxy-4-[3-(2-methyl-4-nitro-1H-imidazol-1-yl)prop­oxy]benzaldehyde 
In the title mol­ecule, C15H17N3O5, the dihedral angle between the benzene and imidazole rings is 3.69 (2)°. The crystal structure is stabilized by weak inter­molecular C—H⋯O hydrogen bonds and π–π stacking inter­actions with a centroid–centroid distance of 3.614 (1) Å.
doi:10.1107/S1600536809031894
PMCID: PMC2969872  PMID: 21577572
25.  Crystal structure of (Z)-3-[5-chloro-2-(prop-2-yn­yloxy)phen­yl]-3-hy­droxy-1-[4-(tri­fluoro­meth­yl)phen­yl]­prop-2-en-1-one 
The title compound, C19H12ClF3O3, obtained by the photochemical transformation of 2-[5-chloro-2-(prop-2-yn­yloxy)benzo­yl]-3-[4-(tri­fluoro­meth­yl)phen­yl]oxirane adopts a Z conformation with respect to the enolic C=C double bond. The dihedral angle between the benzene rings is 12.25 (16)° and an intra­molecular O—H⋯O hydrogen bond closes an S(6) ring. An intra­molecular C—H⋯O inter­action also leads to an S(6) ring. In the crystal, very weak C—H⋯O inter­actions and short Cl⋯Cl contacts [3.3221 (16) Å] are seen, as well as weak aromatic π–π stacking inter­actions [centroid–centroid separation = 3.879 (2) Å].
doi:10.1107/S2056989015012748
PMCID: PMC4571394  PMID: 26396794
crystal structure; hy­droxy enone; tautomerisation; hydrogen bonding; photo-isomerisation

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