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Acta Crystallogr Sect E Struct Rep Online. 2009 January 1; 65(Pt 1): o128.
Published online 2008 December 17. doi:  10.1107/S1600536808042074
PMCID: PMC2968048

3-(4-Methoxy­phen­yl)-1H-isochromen-1-one

Abstract

The asymmetric unit of the title compound, C16H12O3, contains two crystallographically independent mol­ecules. The isochromene ring system is planar (maximum deviation 0.024 Å) and is oriented at dihedral angles of 2.63 (3) and 0.79 (3)° with respect to the methoxy­benzene rings in the two independent mol­ecules.

Related literature

For general background, see: Barry (1964 [triangle]); Hill (1986 [triangle]); Canendo et al. (1997 [triangle]); Whyte et al. (1996 [triangle]). For related structures, see: Abid et al. (2006 [triangle], 2008 [triangle]); Hathwar et al. (2007 [triangle]).

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Object name is e-65-0o128-scheme1.jpg

Experimental

Crystal data

  • C16H12O3
  • M r = 252.26
  • Monoclinic, An external file that holds a picture, illustration, etc.
Object name is e-65-0o128-efi1.jpg
  • a = 15.5949 (15) Å
  • b = 11.8464 (11) Å
  • c = 15.1824 (14) Å
  • β = 117.838 (2)°
  • V = 2480.2 (4) Å3
  • Z = 8
  • Mo Kα radiation
  • μ = 0.09 mm−1
  • T = 290 (2) K
  • 0.28 × 0.14 × 0.08 mm

Data collection

  • Bruker SMART CCD area-detector diffractometer
  • Absorption correction: multi-scan (SADABS; Sheldrick, 1996 [triangle]) T min = 0.974, T max = 0.984
  • 18262 measured reflections
  • 4616 independent reflections
  • 2795 reflections with I > 2σ(I)
  • R int = 0.038

Refinement

  • R[F 2 > 2σ(F 2)] = 0.045
  • wR(F 2) = 0.109
  • S = 1.00
  • 4616 reflections
  • 345 parameters
  • All H-atom parameters refined
  • Δρmax = 0.15 e Å−3
  • Δρmin = −0.15 e Å−3

Data collection: SMART (Bruker, 2004 [triangle]); cell refinement: SAINT (Bruker, 2004 [triangle]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: ORTEP-3 (Farrugia, 1997 [triangle]) and CAMERON (Watkin et al., 1993 [triangle]); software used to prepare material for publication: PLATON (Spek, 2003 [triangle]).

Supplementary Material

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536808042074/nc2128sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536808042074/nc2128Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

We thank the Department of Science and Technology, India, for use of the CCD facility set up under the IRHPADST program at IISc. We thank Professor T. N. Guru Row, IISc, Bangalore, for useful crystallographic discussions. FNK thanks the DST for Fast Track Proposal funding

supplementary crystallographic information

Comment

Isochromenones are structurally related to the chromenones, (Hill, 1986). They have a wide range of biological activities (Hill, 1986; Canendo et al., 1997; Whyte et al., 1996). Isocoumarins (Barry, 1964) are also useful intermediates in the synthesis of a variety of important compounds including some carbocyclic and heterocyclic compounds. In view of their natural occurrence, biological activities and utility as synthetic intermediates, we have synthesized the title compound, and reported herein its crystal structure.

The asymmetric unit of the title compound contains two crystallographically independent molecules of similar geometry. The dihedral angels between the isochromene ring system and the methoxybenzene rings amount to 2.63 (3) and 0.79 (3) ° in the two crystallographically independent molecules

Experimental

Homophthalic acid (1.3 g, 7.2 mmol) was added to p-methoxybenzoyl chloride (24.8 mmol) and was refluxed for 4 h at 473 K with stirring. The reaction mixture was extracted with ethyl acetate (3 times 100 ml), and an aqueous solution of sodium carbonate (5%, 200 ml) was added to remove the unreacted homophthalic acid. The organic layer was separated, concentrated and chromatographed on silica gel using petroleum ether (313–353 K fractions) as eluent to afford the title compound. Single crystals suitable for X-ray analysis were obtained by slow evaporation of an ethyl acetate solution.

Refinement

All H atoms were positioned with idealized geometry and were refined using a riding model with C-H = 0.96 Å for CH3 and 0.93 Å for aromatic H atoms. The displacement parameters of the H atoms were constrained as Uiso(H) = 1.2Ueq (1.5Ueq for methyl) of the carrier atom.

Figures

Fig. 1.
: Crystal structure of the title complex, showing 50% probability displacement ellipsoids and the atom-numbering scheme.

Crystal data

C16H12O3F(000) = 1056
Mr = 252.26Dx = 1.351 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 8668 reflections
a = 15.5949 (15) Åθ = 1.5–25.5°
b = 11.8464 (11) ŵ = 0.09 mm1
c = 15.1824 (14) ÅT = 290 K
β = 117.838 (2)°Block, colourless
V = 2480.2 (4) Å30.28 × 0.14 × 0.08 mm
Z = 8

Data collection

Bruker SMART CCD area-detector diffractometer4616 independent reflections
Radiation source: fine-focus sealed tube2795 reflections with I > 2σ(I)
graphiteRint = 0.038
[var phi] and ω scansθmax = 25.5°, θmin = 1.5°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)h = −18→18
Tmin = 0.974, Tmax = 0.984k = −13→14
18262 measured reflectionsl = −18→18

Refinement

Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.045Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.109All H-atom parameters refined
S = 1.00w = 1/[σ2(Fo2) + (0.0567P)2] where P = (Fo2 + 2Fc2)/3
4616 reflections(Δ/σ)max = 0.001
345 parametersΔρmax = 0.14 e Å3
0 restraintsΔρmin = −0.15 e Å3

Special details

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2)

xyzUiso*/Ueq
O10.46573 (12)0.71997 (11)1.12417 (10)0.0894 (5)
O20.41915 (8)0.88630 (10)1.05390 (8)0.0602 (3)
O30.35416 (9)1.40912 (10)1.06979 (10)0.0762 (4)
O40.03964 (12)0.71696 (11)0.15948 (11)0.0912 (5)
O50.08196 (8)0.88474 (10)0.13156 (8)0.0595 (3)
O60.13583 (9)1.40934 (10)0.20493 (9)0.0667 (4)
C10.43111 (14)0.77173 (16)1.04693 (14)0.0606 (5)
C20.38013 (11)0.95680 (14)0.97170 (12)0.0470 (4)
C30.35328 (11)0.91498 (14)0.88124 (12)0.0496 (4)
H30.32760.96340.82670.060*
C40.33679 (13)0.75059 (16)0.77199 (13)0.0600 (5)
H40.31210.79670.71590.072*
C50.34738 (13)0.63695 (17)0.76232 (14)0.0667 (5)
H50.33050.60690.69980.080*
C60.38271 (13)0.56691 (17)0.84417 (15)0.0690 (5)
H60.38850.48990.83640.083*
C70.40934 (13)0.61035 (16)0.93675 (14)0.0646 (5)
H70.43320.56300.99200.077*
C80.40056 (12)0.72591 (15)0.94798 (12)0.0503 (4)
C90.36294 (11)0.79755 (14)0.86563 (12)0.0475 (4)
C100.37489 (11)1.07382 (14)1.00008 (12)0.0467 (4)
C110.40524 (12)1.10565 (15)1.09812 (12)0.0551 (5)
H110.42971.05081.14760.066*
C120.40041 (13)1.21545 (16)1.12477 (13)0.0581 (5)
H120.42211.23401.19130.070*
C130.36364 (13)1.29749 (15)1.05313 (14)0.0552 (5)
C140.33210 (13)1.26874 (16)0.95395 (14)0.0629 (5)
H140.30671.32380.90470.076*
C150.33854 (13)1.15925 (15)0.92883 (13)0.0593 (5)
H150.31811.14140.86230.071*
C160.38761 (16)1.44487 (18)1.16989 (16)0.0882 (7)
H16A0.34741.41261.19560.132*
H16B0.38461.52571.17200.132*
H16C0.45341.42051.20960.132*
C170.07336 (13)0.77001 (16)0.11542 (13)0.0607 (5)
C180.11848 (11)0.95659 (14)0.08575 (11)0.0473 (4)
C190.14586 (11)0.91583 (14)0.02099 (12)0.0507 (4)
H190.16910.9653−0.01050.061*
C200.16909 (13)0.75191 (15)−0.06827 (14)0.0608 (5)
H200.19140.7993−0.10200.073*
C210.16469 (14)0.63793 (17)−0.08482 (14)0.0690 (5)
H210.18460.6087−0.12920.083*
C220.13085 (14)0.56579 (17)−0.03610 (14)0.0713 (6)
H220.12810.4884−0.04760.086*
C230.10135 (13)0.60905 (16)0.02928 (14)0.0664 (5)
H230.07850.56090.06200.080*
C240.10552 (12)0.72472 (15)0.04675 (12)0.0510 (4)
C250.14046 (11)0.79797 (14)−0.00148 (12)0.0477 (4)
C260.12307 (11)1.07354 (14)0.11878 (11)0.0471 (4)
C270.09425 (12)1.10360 (15)0.18924 (12)0.0575 (5)
H270.07231.04760.21670.069*
C280.09700 (13)1.21374 (15)0.22010 (13)0.0584 (5)
H280.07721.23120.26750.070*
C290.12929 (12)1.29732 (15)0.18019 (13)0.0517 (5)
C300.15888 (13)1.26986 (15)0.10993 (14)0.0621 (5)
H300.18111.32610.08290.074*
C310.15544 (13)1.16016 (15)0.08009 (13)0.0595 (5)
H310.17531.14320.03260.071*
C320.09712 (14)1.44297 (16)0.26951 (14)0.0770 (6)
H32A0.03171.41630.24340.115*
H32B0.09791.52380.27410.115*
H32C0.13581.41140.33450.115*

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
O10.1390 (14)0.0681 (9)0.0507 (8)0.0230 (9)0.0355 (9)0.0148 (7)
O20.0798 (9)0.0542 (8)0.0436 (7)0.0102 (6)0.0262 (6)0.0041 (6)
O30.0977 (11)0.0546 (9)0.0764 (10)0.0029 (7)0.0407 (8)−0.0108 (7)
O40.1466 (14)0.0660 (9)0.1082 (11)−0.0176 (9)0.0991 (11)−0.0002 (8)
O50.0785 (9)0.0537 (8)0.0633 (8)−0.0091 (6)0.0473 (7)−0.0027 (6)
O60.0808 (9)0.0559 (9)0.0723 (9)−0.0028 (7)0.0431 (7)−0.0091 (7)
C10.0737 (14)0.0577 (13)0.0510 (12)0.0102 (10)0.0295 (11)0.0063 (10)
C20.0468 (10)0.0532 (12)0.0422 (10)0.0010 (8)0.0216 (8)0.0069 (9)
C30.0550 (11)0.0513 (12)0.0421 (10)0.0013 (8)0.0222 (9)0.0070 (8)
C40.0612 (13)0.0649 (14)0.0481 (11)−0.0035 (10)0.0207 (10)−0.0031 (9)
C50.0642 (13)0.0718 (15)0.0568 (13)−0.0066 (11)0.0220 (11)−0.0176 (11)
C60.0734 (14)0.0573 (13)0.0729 (14)0.0018 (10)0.0313 (12)−0.0088 (11)
C70.0747 (14)0.0571 (14)0.0642 (13)0.0108 (10)0.0343 (11)0.0048 (10)
C80.0505 (11)0.0533 (12)0.0491 (11)0.0024 (9)0.0249 (9)0.0002 (9)
C90.0424 (10)0.0560 (12)0.0446 (11)−0.0041 (8)0.0208 (9)−0.0018 (9)
C100.0425 (10)0.0514 (11)0.0458 (10)−0.0009 (8)0.0203 (8)0.0010 (9)
C110.0613 (12)0.0582 (13)0.0469 (11)0.0034 (9)0.0261 (9)0.0023 (9)
C120.0663 (13)0.0611 (13)0.0477 (11)0.0006 (10)0.0271 (10)−0.0052 (10)
C130.0554 (12)0.0506 (13)0.0622 (13)−0.0029 (9)0.0296 (10)−0.0074 (10)
C140.0723 (14)0.0546 (13)0.0527 (12)0.0058 (10)0.0215 (10)0.0072 (10)
C150.0704 (13)0.0562 (13)0.0458 (11)0.0014 (10)0.0226 (10)−0.0015 (9)
C160.1071 (18)0.0744 (16)0.0891 (16)−0.0108 (13)0.0508 (14)−0.0317 (13)
C170.0746 (14)0.0555 (13)0.0621 (12)−0.0061 (10)0.0404 (11)0.0017 (10)
C180.0462 (10)0.0534 (12)0.0451 (10)−0.0041 (8)0.0236 (9)0.0041 (8)
C190.0535 (11)0.0532 (12)0.0514 (10)−0.0030 (8)0.0296 (9)0.0036 (9)
C200.0659 (13)0.0609 (14)0.0676 (12)−0.0032 (10)0.0413 (11)−0.0041 (10)
C210.0744 (14)0.0692 (14)0.0755 (14)0.0024 (11)0.0451 (12)−0.0095 (11)
C220.0824 (15)0.0551 (13)0.0783 (14)0.0029 (10)0.0391 (12)−0.0053 (11)
C230.0775 (14)0.0581 (14)0.0695 (13)−0.0065 (10)0.0393 (11)−0.0005 (10)
C240.0512 (11)0.0520 (12)0.0501 (10)−0.0006 (9)0.0237 (9)−0.0003 (9)
C250.0428 (10)0.0552 (12)0.0444 (10)0.0001 (8)0.0198 (9)0.0005 (9)
C260.0442 (10)0.0524 (11)0.0453 (10)−0.0005 (8)0.0213 (8)0.0017 (8)
C270.0646 (12)0.0618 (13)0.0562 (11)−0.0057 (9)0.0365 (10)0.0009 (9)
C280.0684 (13)0.0622 (13)0.0551 (11)−0.0019 (10)0.0377 (10)−0.0064 (10)
C290.0519 (11)0.0509 (12)0.0523 (11)0.0009 (9)0.0243 (9)−0.0022 (9)
C300.0728 (14)0.0543 (12)0.0749 (13)−0.0098 (10)0.0478 (12)−0.0024 (10)
C310.0731 (13)0.0595 (13)0.0634 (12)−0.0060 (10)0.0465 (11)−0.0055 (10)
C320.0862 (15)0.0708 (15)0.0819 (14)0.0036 (11)0.0459 (13)−0.0175 (11)

Geometric parameters (Å, °)

O1—C11.2048 (19)C14—H140.9300
O2—C11.381 (2)C15—H150.9300
O2—C21.3842 (18)C16—H16A0.9600
O3—C131.3672 (19)C16—H16B0.9600
O3—C161.422 (2)C16—H16C0.9600
O4—C171.2032 (19)C17—C241.454 (2)
O5—C171.3765 (19)C18—C191.332 (2)
O5—C181.3794 (17)C18—C261.464 (2)
O6—C291.3700 (18)C19—C251.431 (2)
O6—C321.4272 (19)C19—H190.9300
C1—C81.453 (2)C20—C211.369 (2)
C2—C31.330 (2)C20—C251.396 (2)
C2—C101.465 (2)C20—H200.9300
C3—C91.431 (2)C21—C221.386 (3)
C3—H30.9300C21—H210.9300
C4—C51.373 (2)C22—C231.373 (2)
C4—C91.398 (2)C22—H220.9300
C4—H40.9300C23—C241.391 (2)
C5—C61.377 (2)C23—H230.9300
C5—H50.9300C24—C251.400 (2)
C6—C71.367 (2)C26—C271.387 (2)
C6—H60.9300C26—C311.389 (2)
C7—C81.394 (2)C27—C281.380 (2)
C7—H70.9300C27—H270.9300
C8—C91.394 (2)C28—C291.373 (2)
C10—C111.387 (2)C28—H280.9300
C10—C151.394 (2)C29—C301.384 (2)
C11—C121.375 (2)C30—C311.369 (2)
C11—H110.9300C30—H300.9300
C12—C131.369 (2)C31—H310.9300
C12—H120.9300C32—H32A0.9600
C13—C141.391 (2)C32—H32B0.9600
C14—C151.369 (2)C32—H32C0.9600
C1—O2—C2122.83 (14)H16A—C16—H16C109.5
C13—O3—C16117.94 (15)H16B—C16—H16C109.5
C17—O5—C18123.25 (13)O4—C17—O5116.63 (16)
C29—O6—C32117.23 (14)O4—C17—C24126.34 (18)
O1—C1—O2116.16 (16)O5—C17—C24117.03 (15)
O1—C1—C8126.72 (19)C19—C18—O5119.92 (15)
O2—C1—C8117.12 (16)C19—C18—C26127.93 (15)
C3—C2—O2120.00 (16)O5—C18—C26112.14 (13)
C3—C2—C10128.46 (16)C18—C19—C25121.77 (15)
O2—C2—C10111.54 (14)C18—C19—H19119.1
C2—C3—C9121.76 (16)C25—C19—H19119.1
C2—C3—H3119.1C21—C20—C25120.88 (17)
C9—C3—H3119.1C21—C20—H20119.6
C5—C4—C9120.42 (17)C25—C20—H20119.6
C5—C4—H4119.8C20—C21—C22120.60 (18)
C9—C4—H4119.8C20—C21—H21119.7
C4—C5—C6120.79 (18)C22—C21—H21119.7
C4—C5—H5119.6C23—C22—C21119.68 (19)
C6—C5—H5119.6C23—C22—H22120.2
C7—C6—C5120.17 (19)C21—C22—H22120.2
C7—C6—H6119.9C22—C23—C24120.24 (18)
C5—C6—H6119.9C22—C23—H23119.9
C6—C7—C8119.70 (18)C24—C23—H23119.9
C6—C7—H7120.2C23—C24—C25120.39 (16)
C8—C7—H7120.2C23—C24—C17119.93 (16)
C9—C8—C7120.83 (16)C25—C24—C17119.69 (17)
C9—C8—C1119.83 (17)C20—C25—C24118.20 (16)
C7—C8—C1119.34 (17)C20—C25—C19123.49 (15)
C8—C9—C4118.06 (16)C24—C25—C19118.31 (15)
C8—C9—C3118.44 (15)C27—C26—C31116.70 (16)
C4—C9—C3123.50 (16)C27—C26—C18121.72 (15)
C11—C10—C15116.53 (16)C31—C26—C18121.58 (14)
C11—C10—C2122.33 (16)C28—C27—C26122.33 (16)
C15—C10—C2121.13 (15)C28—C27—H27118.8
C12—C11—C10122.34 (17)C26—C27—H27118.8
C12—C11—H11118.8C29—C28—C27119.43 (16)
C10—C11—H11118.8C29—C28—H28120.3
C13—C12—C11119.88 (17)C27—C28—H28120.3
C13—C12—H12120.1O6—C29—C28124.97 (16)
C11—C12—H12120.1O6—C29—C30115.46 (16)
O3—C13—C12125.53 (17)C28—C29—C30119.57 (17)
O3—C13—C14115.03 (17)C31—C30—C29120.16 (17)
C12—C13—C14119.44 (17)C31—C30—H30119.9
C15—C14—C13119.93 (17)C29—C30—H30119.9
C15—C14—H14120.0C30—C31—C26121.81 (16)
C13—C14—H14120.0C30—C31—H31119.1
C14—C15—C10121.87 (16)C26—C31—H31119.1
C14—C15—H15119.1O6—C32—H32A109.5
C10—C15—H15119.1O6—C32—H32B109.5
O3—C16—H16A109.5H32A—C32—H32B109.5
O3—C16—H16B109.5O6—C32—H32C109.5
H16A—C16—H16B109.5H32A—C32—H32C109.5
O3—C16—H16C109.5H32B—C32—H32C109.5
C2—O2—C1—O1−179.82 (16)C18—O5—C17—O4−179.43 (17)
C2—O2—C1—C8−0.1 (2)C18—O5—C17—C240.4 (2)
C1—O2—C2—C3−0.7 (2)C17—O5—C18—C191.2 (2)
C1—O2—C2—C10179.49 (14)C17—O5—C18—C26−177.86 (14)
O2—C2—C3—C90.4 (2)O5—C18—C19—C25−1.3 (2)
C10—C2—C3—C9−179.86 (14)C26—C18—C19—C25177.58 (15)
C9—C4—C5—C60.8 (3)C25—C20—C21—C220.6 (3)
C4—C5—C6—C7−1.1 (3)C20—C21—C22—C230.1 (3)
C5—C6—C7—C80.0 (3)C21—C22—C23—C24−0.1 (3)
C6—C7—C8—C91.4 (3)C22—C23—C24—C25−0.5 (3)
C6—C7—C8—C1−178.60 (17)C22—C23—C24—C17179.46 (17)
O1—C1—C8—C9−179.05 (18)O4—C17—C24—C23−2.0 (3)
O2—C1—C8—C91.3 (2)O5—C17—C24—C23178.20 (15)
O1—C1—C8—C71.0 (3)O4—C17—C24—C25177.94 (19)
O2—C1—C8—C7−178.74 (15)O5—C17—C24—C25−1.9 (2)
C7—C8—C9—C4−1.7 (2)C21—C20—C25—C24−1.1 (3)
C1—C8—C9—C4178.31 (15)C21—C20—C25—C19178.23 (16)
C7—C8—C9—C3178.43 (14)C23—C24—C25—C201.1 (2)
C1—C8—C9—C3−1.6 (2)C17—C24—C25—C20−178.86 (15)
C5—C4—C9—C80.6 (2)C23—C24—C25—C19−178.30 (15)
C5—C4—C9—C3−179.54 (16)C17—C24—C25—C191.8 (2)
C2—C3—C9—C80.7 (2)C18—C19—C25—C20−179.51 (16)
C2—C3—C9—C4−179.12 (16)C18—C19—C25—C24−0.2 (2)
C3—C2—C10—C11179.61 (16)C19—C18—C26—C27−178.18 (17)
O2—C2—C10—C11−0.6 (2)O5—C18—C26—C270.8 (2)
C3—C2—C10—C15−0.3 (3)C19—C18—C26—C312.6 (3)
O2—C2—C10—C15179.50 (14)O5—C18—C26—C31−178.40 (15)
C15—C10—C11—C12−0.2 (2)C31—C26—C27—C280.1 (3)
C2—C10—C11—C12179.95 (15)C18—C26—C27—C28−179.13 (15)
C10—C11—C12—C130.7 (3)C26—C27—C28—C290.0 (3)
C16—O3—C13—C122.0 (3)C32—O6—C29—C28−6.6 (2)
C16—O3—C13—C14−178.23 (17)C32—O6—C29—C30173.92 (16)
C11—C12—C13—O3179.38 (15)C27—C28—C29—O6−179.69 (15)
C11—C12—C13—C14−0.4 (3)C27—C28—C29—C30−0.2 (3)
O3—C13—C14—C15179.79 (16)O6—C29—C30—C31179.88 (15)
C12—C13—C14—C15−0.4 (3)C28—C29—C30—C310.4 (3)
C13—C14—C15—C100.9 (3)C29—C30—C31—C26−0.3 (3)
C11—C10—C15—C14−0.7 (3)C27—C26—C31—C300.0 (3)
C2—C10—C15—C14179.22 (15)C18—C26—C31—C30179.28 (16)

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: NC2128).

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