Literature DB >> 22346909

3,3'-[(4-Nitro-phen-yl)methyl-ene]bis-(4-hy-droxy-2H-chromen-2-one).

N Ravikumar1, G Gopikrishna, K Anand Solomon.   

Abstract

The molecular conformation of the title compound, C(25)H(15)NO(8), is stabilized by strong intramolecular O-H⋯O hydrogen bonds, resulting in the formation of S(1) (1)(7) ring motifs. In the crystal, π-π stacking inter-actions are observed between adjacent nitrobenzene and pyranone rings with a centroid-centroid distance of 3.513 (12) Å. The dihedral angles between the nitrobenzene ring and the coumarin ring systems are 65.61 (8) and 66.11 (8)° while the coumarin ring systems are inclined at 65.69 (8)°.

Entities:  

Year:  2012        PMID: 22346909      PMCID: PMC3274964          DOI: 10.1107/S1600536811054778

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For the synthesis of benzyl­idene-bis-(4-hy­droxy­coumarin) derivatives, see: Mehrabi & Abusaidi (2010 ▶); Završnik et al. (2011 ▶). For hydrogen bonds, see: Desiraju & Steiner (1999 ▶). For graph-set analysis of hydrogen bonds, see: Etter et al. (1990 ▶); Bernstein et al. (1995 ▶). For the biological activity of substituted benzyl­idene-bis-(4-hy­droxy­coumarin) derivatives, see: Borges et al. (2005 ▶); Nolan et al. (2009 ▶); Prakash et al. (2008 ▶); Zhao et al. (1997 ▶).

Experimental

Crystal data

C25H15NO8 M = 457.38 Orthorhombic, a = 14.0061 (6) Å b = 14.1511 (6) Å c = 10.4179 (4) Å V = 2064.85 (15) Å3 Z = 4 Mo Kα radiation μ = 0.11 mm−1 T = 295 K 0.35 × 0.30 × 0.25 mm

Data collection

Bruker Kappa APEXII CCD diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2004 ▶) T min = 0.902, T max = 0.973 15733 measured reflections 3316 independent reflections 2913 reflections with I > 2σ(I) R int = 0.030

Refinement

R[F 2 > 2σ(F 2)] = 0.033 wR(F 2) = 0.089 S = 1.04 3316 reflections 310 parameters 1 restraint H-atom parameters constrained Δρmax = 0.22 e Å−3 Δρmin = −0.14 e Å−3 Data collection: APEX2 (Bruker, 2004 ▶); cell refinement: SAINT (Bruker, 2004 ▶); data reduction: SAINT; program(s) used to solve structure: SIR92 (Altomare et al., 1993 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 (Farrugia, 1997 ▶) and Mercury (Macrae et al., 2006 ▶); software used to prepare material for publication: PLATON (Spek, 2009 ▶). Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536811054778/rk2323sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811054778/rk2323Isup2.hkl Supplementary material file. DOI: 10.1107/S1600536811054778/rk2323Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C25H15NO8F(000) = 944
Mr = 457.38Dx = 1.471 Mg m3
Orthorhombic, Pna21Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2c -2nCell parameters from 6438 reflections
a = 14.0061 (6) Åθ = 2.1–24.2°
b = 14.1511 (6) ŵ = 0.11 mm1
c = 10.4179 (4) ÅT = 295 K
V = 2064.85 (15) Å3Block, orange
Z = 40.35 × 0.30 × 0.25 mm
Bruker Kappa APEXII CCD diffractometer3316 independent reflections
Radiation source: fine-focus sealed tube2913 reflections with I > 2σ(I)
graphiteRint = 0.030
ω and φ scansθmax = 24.3°, θmin = 2.1°
Absorption correction: multi-scan (SADABS; Bruker, 2004)h = −15→16
Tmin = 0.902, Tmax = 0.973k = −16→16
15733 measured reflectionsl = −12→12
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.033H-atom parameters constrained
wR(F2) = 0.089w = 1/[σ2(Fo2) + (0.0543P)2 + 0.1473P] where P = (Fo2 + 2Fc2)/3
S = 1.04(Δ/σ)max < 0.001
3316 reflectionsΔρmax = 0.22 e Å3
310 parametersΔρmin = −0.14 e Å3
1 restraintExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methodsExtinction coefficient: 0.0066 (11)
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.
xyzUiso*/Ueq
C10.65097 (16)0.52018 (16)0.9180 (2)0.0425 (5)
C20.67257 (16)0.67214 (16)0.8278 (2)0.0465 (5)
C30.73555 (19)0.7470 (2)0.8087 (3)0.0672 (7)
H30.79650.74610.84420.081*
C40.7053 (2)0.8221 (2)0.7359 (4)0.0817 (9)
H40.74640.87240.72100.098*
C50.6141 (2)0.82367 (19)0.6844 (3)0.0757 (9)
H50.59470.87510.63530.091*
C60.55268 (19)0.75111 (17)0.7049 (3)0.0585 (6)
H60.49150.75310.67040.070*
C70.58132 (16)0.67400 (16)0.7773 (2)0.0455 (5)
C80.52015 (15)0.59312 (15)0.80351 (19)0.0412 (5)
C90.55171 (14)0.52169 (14)0.87827 (19)0.0374 (5)
C100.49380 (14)0.43608 (14)0.9198 (2)0.0377 (5)
H100.53010.40970.99180.045*
C110.49566 (14)0.35862 (15)0.81912 (19)0.0403 (5)
C120.42673 (16)0.36412 (15)0.7157 (2)0.0422 (5)
C130.49157 (18)0.22343 (14)0.6267 (2)0.0492 (6)
C140.4862 (2)0.15815 (18)0.5260 (3)0.0643 (7)
H140.43790.16140.46500.077*
C150.5557 (2)0.08853 (19)0.5208 (3)0.0742 (9)
H150.55370.04360.45560.089*
C160.6277 (2)0.08488 (19)0.6106 (3)0.0698 (8)
H160.67420.03820.60470.084*
C170.6315 (2)0.14788 (16)0.7066 (3)0.0623 (7)
H170.68060.14410.76650.075*
C180.56350 (17)0.21869 (15)0.7178 (2)0.0486 (6)
C190.56297 (16)0.29003 (15)0.8164 (2)0.0484 (6)
C200.39601 (14)0.45796 (15)0.9770 (2)0.0389 (5)
C210.37848 (15)0.54447 (15)1.0351 (2)0.0453 (5)
H210.42330.59261.02770.054*
C220.29604 (17)0.56044 (17)1.1036 (2)0.0516 (6)
H220.28530.61841.14310.062*
C230.22999 (15)0.48919 (18)1.1123 (2)0.0503 (6)
C240.24222 (17)0.40444 (18)1.0508 (2)0.0534 (6)
H240.19510.35821.05370.064*
C250.32609 (17)0.38952 (15)0.9845 (2)0.0472 (5)
H250.33580.33180.94380.057*
N10.14454 (16)0.5031 (2)1.1934 (2)0.0652 (6)
O10.69024 (11)0.45293 (11)0.96905 (17)0.0531 (4)
O20.70638 (10)0.59589 (11)0.89430 (15)0.0509 (4)
O30.43458 (11)0.59699 (11)0.74979 (15)0.0502 (4)
H3A0.41160.54380.74690.075*
O40.42395 (12)0.29414 (11)0.62710 (16)0.0528 (4)
O50.37047 (12)0.42867 (11)0.70029 (16)0.0515 (4)
O60.63447 (12)0.28370 (12)0.90099 (19)0.0663 (5)
H6A0.64860.33670.92660.099*
O70.08403 (15)0.44080 (18)1.1938 (3)0.0931 (7)
O80.13895 (14)0.57467 (17)1.2562 (2)0.0814 (6)
U11U22U33U12U13U23
C10.0420 (12)0.0473 (13)0.0382 (11)0.0001 (11)0.0025 (9)−0.0094 (10)
C20.0413 (12)0.0472 (13)0.0511 (13)−0.0003 (11)0.0030 (11)−0.0054 (11)
C30.0438 (14)0.0689 (17)0.089 (2)−0.0088 (13)0.0035 (14)−0.0068 (16)
C40.0630 (19)0.0618 (17)0.120 (3)−0.0202 (14)0.0069 (18)0.0188 (19)
C50.0685 (19)0.0583 (16)0.100 (2)−0.0043 (14)0.0060 (17)0.0207 (16)
C60.0534 (15)0.0545 (14)0.0677 (16)0.0010 (12)0.0029 (12)0.0087 (13)
C70.0428 (12)0.0449 (12)0.0488 (12)−0.0003 (10)0.0089 (10)−0.0043 (10)
C80.0337 (11)0.0490 (13)0.0409 (12)0.0026 (10)0.0026 (9)−0.0021 (10)
C90.0342 (11)0.0427 (11)0.0354 (11)0.0005 (9)0.0016 (9)−0.0049 (9)
C100.0369 (12)0.0417 (11)0.0345 (10)0.0026 (9)−0.0070 (9)0.0004 (9)
C110.0389 (11)0.0412 (12)0.0409 (12)−0.0014 (9)0.0022 (10)0.0040 (9)
C120.0509 (14)0.0389 (11)0.0368 (11)−0.0038 (11)0.0033 (10)0.0010 (10)
C130.0604 (14)0.0345 (11)0.0526 (13)−0.0015 (10)0.0142 (12)0.0055 (10)
C140.0851 (18)0.0583 (15)0.0494 (14)−0.0100 (15)0.0073 (14)−0.0014 (13)
C150.112 (3)0.0490 (15)0.0616 (18)−0.0094 (16)0.0349 (18)−0.0098 (13)
C160.0773 (19)0.0537 (15)0.079 (2)0.0051 (14)0.0275 (18)0.0036 (15)
C170.0576 (15)0.0484 (14)0.0809 (18)0.0018 (12)0.0105 (13)0.0003 (15)
C180.0493 (13)0.0425 (12)0.0541 (13)−0.0059 (11)0.0042 (11)0.0039 (11)
C190.0480 (13)0.0442 (12)0.0531 (14)−0.0025 (11)−0.0030 (11)0.0054 (11)
C200.0373 (11)0.0486 (12)0.0307 (10)−0.0013 (10)−0.0040 (9)0.0031 (9)
C210.0401 (12)0.0518 (13)0.0441 (12)−0.0054 (10)0.0010 (10)−0.0027 (11)
C220.0475 (13)0.0621 (14)0.0452 (13)0.0028 (11)0.0019 (11)−0.0027 (12)
C230.0352 (12)0.0741 (16)0.0417 (11)0.0025 (11)0.0000 (10)0.0101 (13)
C240.0461 (13)0.0652 (16)0.0488 (13)−0.0126 (12)0.0014 (11)0.0093 (12)
C250.0521 (14)0.0474 (12)0.0421 (12)−0.0071 (11)0.0002 (11)0.0001 (10)
N10.0462 (13)0.0952 (18)0.0543 (13)0.0153 (13)0.0055 (11)0.0188 (14)
O10.0451 (9)0.0569 (9)0.0572 (9)0.0081 (8)−0.0130 (8)−0.0037 (8)
O20.0381 (8)0.0581 (9)0.0565 (9)−0.0053 (8)−0.0031 (7)−0.0013 (8)
O30.0418 (9)0.0545 (9)0.0544 (10)0.0002 (7)−0.0068 (7)0.0087 (8)
O40.0626 (10)0.0494 (9)0.0464 (9)0.0000 (8)−0.0093 (8)−0.0036 (8)
O50.0520 (10)0.0515 (9)0.0510 (9)0.0035 (8)−0.0109 (7)0.0003 (8)
O60.0612 (11)0.0539 (10)0.0837 (13)0.0115 (9)−0.0241 (10)−0.0028 (10)
O70.0484 (12)0.1247 (18)0.1063 (17)−0.0157 (12)0.0204 (12)0.0188 (15)
O80.0626 (12)0.1100 (17)0.0715 (14)0.0265 (12)0.0137 (10)−0.0006 (13)
C1—O11.221 (3)C13—C141.400 (3)
C1—O21.346 (3)C14—C151.386 (4)
C1—C91.451 (3)C14—H140.9300
C2—O21.367 (3)C15—C161.376 (4)
C2—C71.382 (3)C15—H150.9300
C2—C31.393 (3)C16—C171.341 (4)
C3—C41.373 (4)C16—H160.9300
C3—H30.9300C17—C181.388 (3)
C4—C51.385 (4)C17—H170.9300
C4—H40.9300C18—C191.440 (3)
C5—C61.356 (4)C19—O61.337 (3)
C5—H50.9300C20—C251.379 (3)
C6—C71.386 (3)C20—C211.388 (3)
C6—H60.9300C21—C221.376 (3)
C7—C81.456 (3)C21—H210.9300
C8—O31.324 (3)C22—C231.371 (3)
C8—C91.350 (3)C22—H220.9300
C9—C101.521 (3)C23—C241.371 (4)
C10—C111.517 (3)C23—N11.478 (3)
C10—C201.525 (3)C24—C251.379 (3)
C10—H100.9800C24—H240.9300
C11—C191.353 (3)C25—H250.9300
C11—C121.449 (3)N1—O81.209 (3)
C12—O51.217 (2)N1—O71.223 (3)
C12—O41.355 (3)O3—H3A0.8200
C13—O41.378 (3)O6—H6A0.8200
C13—C181.386 (3)
O1—C1—O2116.14 (19)C15—C14—H14121.3
O1—C1—C9124.6 (2)C13—C14—H14121.3
O2—C1—C9119.3 (2)C16—C15—C14120.9 (3)
O2—C2—C7121.88 (19)C16—C15—H15119.5
O2—C2—C3117.0 (2)C14—C15—H15119.5
C7—C2—C3121.1 (2)C17—C16—C15120.8 (3)
C4—C3—C2118.2 (2)C17—C16—H16119.6
C4—C3—H3120.9C15—C16—H16119.6
C2—C3—H3120.9C16—C17—C18121.0 (3)
C3—C4—C5120.8 (3)C16—C17—H17119.5
C3—C4—H4119.6C18—C17—H17119.5
C5—C4—H4119.6C13—C18—C17118.4 (2)
C6—C5—C4120.8 (3)C13—C18—C19116.8 (2)
C6—C5—H5119.6C17—C18—C19124.8 (2)
C4—C5—H5119.6O6—C19—C11123.8 (2)
C5—C6—C7119.9 (3)O6—C19—C18114.8 (2)
C5—C6—H6120.1C11—C19—C18121.4 (2)
C7—C6—H6120.1C25—C20—C21117.97 (19)
C2—C7—C6119.3 (2)C25—C20—C10121.14 (19)
C2—C7—C8117.3 (2)C21—C20—C10120.55 (18)
C6—C7—C8123.4 (2)C22—C21—C20121.3 (2)
O3—C8—C9124.8 (2)C22—C21—H21119.3
O3—C8—C7114.90 (19)C20—C21—H21119.3
C9—C8—C7120.27 (19)C23—C22—C21118.7 (2)
C8—C9—C1119.29 (19)C23—C22—H22120.7
C8—C9—C10125.86 (18)C21—C22—H22120.7
C1—C9—C10114.72 (18)C24—C23—C22121.9 (2)
C11—C10—C9111.69 (17)C24—C23—N1119.0 (2)
C11—C10—C20115.59 (16)C22—C23—N1119.1 (2)
C9—C10—C20115.37 (17)C23—C24—C25118.3 (2)
C11—C10—H10104.2C23—C24—H24120.8
C9—C10—H10104.2C25—C24—H24120.8
C20—C10—H10104.2C24—C25—C20121.7 (2)
C19—C11—C12119.1 (2)C24—C25—H25119.1
C19—C11—C10123.00 (18)C20—C25—H25119.1
C12—C11—C10117.63 (17)O8—N1—O7123.9 (2)
O5—C12—O4116.10 (19)O8—N1—C23118.2 (2)
O5—C12—C11124.8 (2)O7—N1—C23117.9 (3)
O4—C12—C11119.12 (19)C1—O2—C2121.44 (17)
O4—C13—C18122.2 (2)C8—O3—H3A109.5
O4—C13—C14116.4 (2)C12—O4—C13120.87 (19)
C18—C13—C14121.3 (2)C19—O6—H6A109.5
C15—C14—C13117.5 (3)
O2—C2—C3—C4176.3 (2)O4—C13—C18—C17−176.8 (2)
C7—C2—C3—C4−1.3 (4)C14—C13—C18—C170.7 (3)
C2—C3—C4—C50.8 (5)O4—C13—C18—C191.8 (3)
C3—C4—C5—C60.0 (5)C14—C13—C18—C19179.3 (2)
C4—C5—C6—C7−0.4 (5)C16—C17—C18—C13−0.5 (4)
O2—C2—C7—C6−176.6 (2)C16—C17—C18—C19−179.0 (2)
C3—C2—C7—C61.0 (4)C12—C11—C19—O6174.1 (2)
O2—C2—C7—C83.1 (3)C10—C11—C19—O6−0.3 (3)
C3—C2—C7—C8−179.3 (2)C12—C11—C19—C18−4.3 (3)
C5—C6—C7—C2−0.1 (4)C10—C11—C19—C18−178.79 (19)
C5—C6—C7—C8−179.8 (2)C13—C18—C19—O6−179.0 (2)
C2—C7—C8—O3−177.99 (19)C17—C18—C19—O6−0.5 (3)
C6—C7—C8—O31.7 (3)C13—C18—C19—C11−0.4 (3)
C2—C7—C8—C92.4 (3)C17—C18—C19—C11178.1 (2)
C6—C7—C8—C9−177.9 (2)C11—C10—C20—C2528.4 (3)
O3—C8—C9—C1172.24 (19)C9—C10—C20—C25161.27 (19)
C7—C8—C9—C1−8.2 (3)C11—C10—C20—C21−158.45 (19)
O3—C8—C9—C10−3.4 (3)C9—C10—C20—C21−25.6 (3)
C7—C8—C9—C10176.20 (19)C25—C20—C21—C223.1 (3)
O1—C1—C9—C8−168.8 (2)C10—C20—C21—C22−170.3 (2)
O2—C1—C9—C88.8 (3)C20—C21—C22—C23−0.8 (3)
O1—C1—C9—C107.3 (3)C21—C22—C23—C24−2.7 (3)
O2—C1—C9—C10−175.05 (17)C21—C22—C23—N1175.6 (2)
C8—C9—C10—C1184.8 (2)C22—C23—C24—C253.7 (3)
C1—C9—C10—C11−91.0 (2)N1—C23—C24—C25−174.5 (2)
C8—C9—C10—C20−49.9 (3)C23—C24—C25—C20−1.3 (3)
C1—C9—C10—C20134.28 (18)C21—C20—C25—C24−2.0 (3)
C9—C10—C11—C1989.4 (2)C10—C20—C25—C24171.3 (2)
C20—C10—C11—C19−136.0 (2)C24—C23—N1—O8173.4 (2)
C9—C10—C11—C12−85.1 (2)C22—C23—N1—O8−4.9 (3)
C20—C10—C11—C1249.5 (3)C24—C23—N1—O7−5.9 (3)
C19—C11—C12—O5−171.1 (2)C22—C23—N1—O7175.9 (2)
C10—C11—C12—O53.7 (3)O1—C1—O2—C2174.34 (19)
C19—C11—C12—O47.8 (3)C9—C1—O2—C2−3.5 (3)
C10—C11—C12—O4−177.41 (17)C7—C2—O2—C1−2.5 (3)
O4—C13—C14—C15177.5 (2)C3—C2—O2—C1179.8 (2)
C18—C13—C14—C15−0.1 (4)O5—C12—O4—C13172.42 (19)
C13—C14—C15—C16−0.8 (4)C11—C12—O4—C13−6.6 (3)
C14—C15—C16—C171.0 (4)C18—C13—O4—C121.8 (3)
C15—C16—C17—C18−0.3 (4)C14—C13—O4—C12−175.8 (2)
D—H···AD—HH···AD···AD—H···A
O3—H3A···O50.821.792.597 (2)166
O6—H6A···O10.821.802.617 (2)173
C10—H10···O10.982.342.809 (3)109
C10—H10···O60.982.492.928 (3)107
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
O3—H3A⋯O50.821.792.597 (2)166
O6—H6A⋯O10.821.802.617 (2)173
  8 in total

1.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

2.  Graph-set analysis of hydrogen-bond patterns in organic crystals.

Authors:  M C Etter; J C MacDonald; J Bernstein
Journal:  Acta Crystallogr B       Date:  1990-04-01

3.  Coumarin-based inhibitors of HIV integrase.

Authors:  H Zhao; N Neamati; H Hong; A Mazumder; S Wang; S Sunder; G W Milne; Y Pommier; T R Burke
Journal:  J Med Chem       Date:  1997-01-17       Impact factor: 7.446

Review 4.  Simple coumarins and analogues in medicinal chemistry: occurrence, synthesis and biological activity.

Authors:  F Borges; F Roleira; N Milhazes; L Santana; E Uriarte
Journal:  Curr Med Chem       Date:  2005       Impact factor: 4.530

5.  Synthesis and biological evaluation of coumarin-based inhibitors of NAD(P)H: quinone oxidoreductase-1 (NQO1).

Authors:  Karen A Nolan; Jeremy R Doncaster; Mark S Dunstan; Katherine A Scott; A David Frenkel; David Siegel; David Ross; John Barnes; Colin Levy; David Leys; Roger C Whitehead; Ian J Stratford; Richard A Bryce
Journal:  J Med Chem       Date:  2009-11-26       Impact factor: 7.446

6.  Synthesis and antifungal activity of some new 3-hydroxy-2-(1-phenyl-3-aryl-4-pyrazolyl) chromones.

Authors:  Om Prakash; Rajesh Kumar; Vipin Parkash
Journal:  Eur J Med Chem       Date:  2007-04-29       Impact factor: 6.514

7.  Benzylidene-bis-(4-hydroxycoumarin) and benzopyrano-coumarin derivatives: synthesis, ¹H/¹³C-NMR conformational and X-ray crystal structure studies and in vitro antiviral activity evaluations.

Authors:  Davorka Završnik; Samija Muratović; Damjan Makuc; Janez Plavec; Mario Cetina; Ante Nagl; Erik De Clercq; Jan Balzarini; Mladen Mintas
Journal:  Molecules       Date:  2011-07-19       Impact factor: 4.411

8.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  8 in total
  2 in total

1.  2,2'-[(3-Bromo-4-hy-droxy-5-meth-oxy-phen-yl)methyl-idene]bis-(3-hy-droxy-5,5-dimethyl-cyclo-hex-2-en-1-one).

Authors:  V Sughanya; N Sureshbabu
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-09-08

2.  2,2'-[(4-Eth-oxy-phen-yl)methyl-ene]bis-(3-hy-droxy-5,5-dimethyl-cyclo-hex-2-en-1-one).

Authors:  N Sureshbabu; V Sughanya
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-08-04
  2 in total

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