supplementary materials


Acta Cryst. (2009). E65, o235    [ doi:10.1107/S1600536808041019 ]

(2Z)-Ethyl 5-(4-methoxyphenyl)-7-methyl-3-oxo-2-(3,4,5-trimethoxybenzylidene)-3,5-dihydro-2H-thiazolo[3,2-a]pyrimidine-6-carboxylate

Z.-H. Hou

Abstract top

In the title compound, C27H28N2O7S, the dihedral angles between the thiazole ring and the mono- and trisubstituted benzene rings are 87.8 (2) and 17.9 (3)°, respectively. The dihydropyrimidine ring adopts a flattened boat conformation. In the crystal structure, [pi]-[pi] stacking occurs [centroid-centroid separation = 3.6611 (11) Å].

Comment top

Fused pyrimidine derivatives represent important target molecules due to their highly pronounced biological properties (Ashok et al., 2007; Monks et al., 1991). In this paper, the structure of the title compound, (I), is reported. The molecular structure of (I) is illustrated in Fig. 1.

The fused thiazole ring C1—C2—N1—C3—S1 has usual geometry as observed in other fused thiazolopyrimidine compounds (Liu et al., 2004a,b; Sridhar et al., 2006). The thiazole ring makes dihedral angles of 87.8 (2) and 17.9 (3)° with the benzene rings C21–C26 and C8–C13, respectively. The pyrimidine ring adopts a flattened boat conformation. The crystal packing of (I) is stabilized by π-π stacking interactions.

Related literature top

For background to the biological properties of fused pyrimidine derivatives, see: Ashok et al. (2007); Monks et al. (1991). For related structures, see: Liu et al. (2004a,b); Sridhar et al. (2006).

Experimental top

A mixture of ethyl 6-methyl-4-(4-methoxyphenyl)-2-thioxo-1,2,3,4- tetrahydropyrimidine-5-carboxylate (0.01 mol), chloroacetic acid (0.01 mol), fused sodium acetate (6 g) in glacial acetic acid (25 ml), acetic anhydride (10 ml) and 3,4,5-trimethoxybenzaldehyde (0.01 mol) was refluxed for 3 h. The reaction mixture was cooled and poured into cold water. The resulting solid was collected and crystallized from methanol to obtain the final product (80% yield, mp 448–449 K). ^1Ĥ NMR (CDCl~3~, p.p.m.): 1.23 (3H, m), 2.60 (3H, s), 3.78(3H,s),3.92(9H,m),4.13(2H,m),6.21 (1H, s), 6.73(2H,s), 6.85 (2H, d),7.36 (2H, d), 7.74 (1H,s). The compound was recrystallized by slow evaporation of an ethanol solution, yielding yellow blocks of (I).

Refinement top

The H atoms were positioned geometrically with C—H = 0.93–0.98 Å and refined as riding with Uiso (H) = 1.2Ueq(C) or 1.5Ueq(methyl C).

Computing details top

Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear (Rigaku, 2005); data reduction: CrystalClear (Rigaku, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of (I), drawn with 50% probability ellipsoids (arbitrary spheres for the H atoms).
(2Z)-Ethyl 5-(4-methoxyphenyl)-7-methyl-3-oxo-2-(3,4,5-trimethoxybenzylidene)-3,5- dihydro-2H-thiazolo[3,2-a]pyrimidine-6-carboxylate top
Crystal data top
C27H28N2O7SZ = 2
Mr = 524.57F(000) = 552
Triclinic, P1Dx = 1.394 Mg m3
Hall symbol: -P 1Melting point = 448–449 K
a = 10.485 (2) ÅMo Kα radiation, λ = 0.71073 Å
b = 10.854 (2) ÅCell parameters from 3693 reflections
c = 11.318 (2) Åθ = 1.9–27.5°
α = 83.42 (3)°µ = 0.18 mm1
β = 77.65 (3)°T = 113 K
γ = 89.00 (3)°Block, yellow
V = 1250.0 (4) Å30.24 × 0.18 × 0.16 mm
Data collection top
Rigaku Saturn CCD
diffractometer
5632 independent reflections
Radiation source: rotating anode4018 reflections with I > 2σ(I)
confocalRint = 0.042
Detector resolution: 7.31 pixels mm-1θmax = 27.5°, θmin = 1.9°
ω and φ scansh = 1313
Absorption correction: multi-scan
(CrystalClear; Rigaku, 2005)
k = 1214
Tmin = 0.958, Tmax = 0.972l = 1314
11123 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.041Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.107H-atom parameters constrained
S = 1.01 w = 1/[σ2(Fo2) + (0.057P)2]
where P = (Fo2 + 2Fc2)/3
5632 reflections(Δ/σ)max = 0.002
340 parametersΔρmax = 0.33 e Å3
0 restraintsΔρmin = 0.25 e Å3
Crystal data top
C27H28N2O7Sγ = 89.00 (3)°
Mr = 524.57V = 1250.0 (4) Å3
Triclinic, P1Z = 2
a = 10.485 (2) ÅMo Kα radiation
b = 10.854 (2) ŵ = 0.18 mm1
c = 11.318 (2) ÅT = 113 K
α = 83.42 (3)°0.24 × 0.18 × 0.16 mm
β = 77.65 (3)°
Data collection top
Rigaku Saturn CCD
diffractometer
5632 independent reflections
Absorption correction: multi-scan
(CrystalClear; Rigaku, 2005)
4018 reflections with I > 2σ(I)
Tmin = 0.958, Tmax = 0.972Rint = 0.042
11123 measured reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.041H-atom parameters constrained
wR(F2) = 0.107Δρmax = 0.33 e Å3
S = 1.01Δρmin = 0.25 e Å3
5632 reflectionsAbsolute structure: ?
340 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Special details top

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.

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S11.07890 (3)0.91459 (4)0.32208 (3)0.01833 (11)
N10.86811 (11)1.04443 (13)0.32885 (11)0.0150 (3)
N21.04753 (12)1.11583 (13)0.17148 (12)0.0199 (3)
O10.72626 (10)0.95600 (11)0.49886 (9)0.0221 (3)
O20.79838 (11)1.43070 (12)0.09675 (10)0.0278 (3)
O30.64354 (10)1.32735 (11)0.23970 (10)0.0205 (3)
O40.42971 (11)0.82312 (12)0.11235 (10)0.0255 (3)
O51.35655 (9)0.56820 (11)0.49941 (10)0.0214 (3)
O61.24509 (10)0.37222 (11)0.62307 (10)0.0225 (3)
O70.98144 (10)0.37091 (11)0.73924 (10)0.0225 (3)
C10.94447 (13)0.87479 (16)0.44286 (13)0.0166 (3)
C20.83361 (14)0.95891 (15)0.43168 (13)0.0154 (3)
C30.99406 (13)1.03930 (15)0.26268 (13)0.0161 (3)
C40.97211 (14)1.22004 (16)0.14268 (13)0.0177 (3)
C50.84306 (14)1.23011 (15)0.19470 (13)0.0156 (3)
C60.77098 (13)1.12589 (15)0.28340 (13)0.0148 (3)
H60.71681.16340.35410.018*
C70.92965 (14)0.78128 (15)0.53324 (13)0.0174 (3)
H70.84710.77930.58810.021*
C81.01696 (14)0.68271 (15)0.56224 (13)0.0161 (3)
C91.15188 (13)0.68154 (15)0.51196 (13)0.0156 (3)
H91.19270.75070.45920.019*
C101.22455 (13)0.57908 (15)0.53991 (13)0.0163 (3)
C111.16642 (14)0.47343 (15)0.61507 (13)0.0158 (3)
C121.03251 (14)0.47620 (16)0.66753 (13)0.0165 (3)
C130.96062 (14)0.58019 (15)0.64275 (13)0.0166 (3)
H130.87080.58250.68110.020*
C141.42504 (14)0.67531 (16)0.43143 (15)0.0223 (4)
H14A1.39880.69210.35310.033*
H14B1.51920.66030.41720.033*
H14C1.40400.74690.47740.033*
C151.23394 (15)0.29536 (17)0.73613 (15)0.0261 (4)
H15A1.22440.34760.80260.039*
H15B1.31250.24470.73390.039*
H15C1.15720.24110.74950.039*
C160.84708 (14)0.37320 (17)0.80105 (15)0.0232 (4)
H16A0.83380.44110.85250.035*
H16B0.82390.29420.85190.035*
H16C0.79180.38590.74110.035*
C171.05115 (15)1.31680 (18)0.05259 (15)0.0262 (4)
H17A1.03791.30800.02920.039*
H17B1.14391.30610.05390.039*
H17C1.02331.39950.07420.039*
C180.76540 (14)1.34015 (16)0.16950 (13)0.0182 (3)
C190.55395 (15)1.42883 (17)0.22755 (17)0.0269 (4)
H19A0.56101.45980.14060.032*
H19B0.57421.49800.27060.032*
C200.41855 (16)1.37926 (19)0.28279 (17)0.0324 (5)
H20A0.39951.31150.23890.049*
H20B0.35501.44570.27690.049*
H20C0.41311.34830.36860.049*
C210.68099 (14)1.05058 (15)0.23002 (13)0.0150 (3)
C220.72323 (14)1.00178 (15)0.12062 (13)0.0168 (3)
H220.80911.02020.07490.020*
C230.64275 (15)0.92636 (16)0.07619 (13)0.0187 (3)
H230.67360.89270.00150.022*
C240.51625 (15)0.90098 (16)0.14285 (14)0.0188 (3)
C250.47053 (14)0.95390 (16)0.25009 (14)0.0193 (4)
H250.38290.93970.29330.023*
C260.55228 (14)1.02701 (15)0.29392 (13)0.0174 (3)
H260.52101.06160.36800.021*
C270.47355 (17)0.76215 (18)0.00619 (15)0.0294 (4)
H27A0.49630.82410.06520.044*
H27B0.40390.70800.00420.044*
H27C0.55060.71240.01490.044*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S10.01300 (17)0.0183 (2)0.0222 (2)0.00274 (15)0.00159 (14)0.00044 (16)
N10.0122 (5)0.0157 (7)0.0170 (6)0.0011 (5)0.0034 (5)0.0009 (5)
N20.0158 (6)0.0206 (8)0.0208 (7)0.0009 (6)0.0002 (5)0.0008 (6)
O10.0149 (5)0.0287 (7)0.0198 (5)0.0038 (5)0.0003 (4)0.0025 (5)
O20.0297 (6)0.0207 (7)0.0289 (6)0.0022 (5)0.0024 (5)0.0063 (5)
O30.0165 (5)0.0171 (6)0.0270 (6)0.0034 (5)0.0043 (4)0.0000 (5)
O40.0257 (6)0.0267 (7)0.0262 (6)0.0093 (5)0.0089 (5)0.0039 (5)
O50.0133 (5)0.0206 (7)0.0264 (6)0.0021 (5)0.0009 (4)0.0030 (5)
O60.0215 (5)0.0194 (7)0.0229 (6)0.0066 (5)0.0012 (4)0.0050 (5)
O70.0157 (5)0.0193 (7)0.0285 (6)0.0007 (5)0.0001 (4)0.0053 (5)
C10.0141 (6)0.0186 (9)0.0176 (7)0.0004 (6)0.0033 (6)0.0041 (6)
C20.0151 (6)0.0155 (8)0.0167 (7)0.0015 (6)0.0060 (6)0.0019 (6)
C30.0121 (6)0.0164 (9)0.0197 (8)0.0020 (6)0.0025 (6)0.0034 (6)
C40.0173 (7)0.0192 (9)0.0162 (7)0.0004 (7)0.0040 (6)0.0003 (6)
C50.0175 (7)0.0148 (8)0.0148 (7)0.0012 (6)0.0042 (6)0.0014 (6)
C60.0134 (6)0.0143 (8)0.0163 (7)0.0017 (6)0.0023 (5)0.0018 (6)
C70.0143 (6)0.0188 (9)0.0193 (8)0.0023 (6)0.0035 (6)0.0030 (7)
C80.0175 (7)0.0175 (9)0.0146 (7)0.0019 (6)0.0061 (6)0.0028 (6)
C90.0153 (6)0.0173 (9)0.0146 (7)0.0013 (6)0.0047 (6)0.0002 (6)
C100.0144 (6)0.0188 (9)0.0157 (7)0.0019 (6)0.0028 (5)0.0032 (6)
C110.0170 (7)0.0151 (9)0.0157 (7)0.0036 (6)0.0053 (6)0.0008 (6)
C120.0170 (7)0.0165 (9)0.0154 (7)0.0017 (6)0.0034 (6)0.0013 (6)
C130.0137 (6)0.0197 (9)0.0165 (7)0.0020 (6)0.0037 (5)0.0017 (6)
C140.0159 (7)0.0235 (10)0.0244 (8)0.0023 (7)0.0011 (6)0.0006 (7)
C150.0203 (7)0.0244 (10)0.0296 (9)0.0017 (7)0.0034 (7)0.0098 (8)
C160.0170 (7)0.0243 (10)0.0247 (8)0.0025 (7)0.0024 (6)0.0001 (7)
C170.0196 (7)0.0283 (11)0.0267 (9)0.0032 (7)0.0004 (7)0.0056 (8)
C180.0206 (7)0.0186 (9)0.0166 (7)0.0002 (7)0.0057 (6)0.0035 (7)
C190.0229 (8)0.0212 (10)0.0385 (10)0.0092 (7)0.0102 (7)0.0057 (8)
C200.0203 (8)0.0355 (12)0.0430 (11)0.0075 (8)0.0080 (7)0.0092 (9)
C210.0152 (6)0.0131 (8)0.0169 (7)0.0005 (6)0.0064 (6)0.0027 (6)
C220.0164 (6)0.0158 (9)0.0176 (7)0.0004 (6)0.0043 (6)0.0011 (6)
C230.0231 (7)0.0183 (9)0.0155 (7)0.0022 (7)0.0060 (6)0.0017 (6)
C240.0203 (7)0.0159 (9)0.0219 (8)0.0018 (7)0.0109 (6)0.0034 (7)
C250.0158 (7)0.0199 (9)0.0218 (8)0.0022 (7)0.0047 (6)0.0012 (7)
C260.0169 (7)0.0181 (9)0.0169 (7)0.0012 (6)0.0034 (6)0.0010 (6)
C270.0357 (9)0.0259 (11)0.0307 (10)0.0048 (8)0.0135 (8)0.0076 (8)
Geometric parameters (Å, °) top
S1—C31.7552 (18)C11—C121.4039 (19)
S1—C11.7616 (15)C12—C131.382 (2)
N1—C31.3754 (17)C13—H130.9500
N1—C21.390 (2)C14—H14A0.9800
N1—C61.474 (2)C14—H14B0.9800
N2—C31.281 (2)C14—H14C0.9800
N2—C41.416 (2)C15—H15A0.9800
O1—C21.2147 (17)C15—H15B0.9800
O2—C181.212 (2)C15—H15C0.9800
O3—C181.3526 (17)C16—H16A0.9800
O3—C191.449 (2)C16—H16B0.9800
O4—C241.3727 (19)C16—H16C0.9800
O4—C271.424 (2)C17—H17A0.9800
O5—C101.3693 (17)C17—H17B0.9800
O5—C141.431 (2)C17—H17C0.9800
O6—C111.3686 (19)C19—C201.505 (2)
O6—C151.429 (2)C19—H19A0.9900
O7—C121.369 (2)C19—H19B0.9900
O7—C161.4338 (16)C20—H20A0.9800
C1—C71.342 (2)C20—H20B0.9800
C1—C21.483 (2)C20—H20C0.9800
C4—C51.3632 (19)C21—C221.385 (2)
C4—C171.501 (2)C21—C261.4006 (19)
C5—C181.469 (2)C22—C231.391 (2)
C5—C61.518 (2)C22—H220.9500
C6—C211.519 (2)C23—C241.393 (2)
C6—H61.0000C23—H230.9500
C7—C81.451 (2)C24—C251.391 (2)
C7—H70.9500C25—C261.381 (2)
C8—C131.406 (2)C25—H250.9500
C8—C91.4078 (19)C26—H260.9500
C9—C101.382 (2)C27—H27A0.9800
C9—H90.9500C27—H27B0.9800
C10—C111.410 (2)C27—H27C0.9800
C3—S1—C191.65 (8)O6—C15—H15A109.5
C3—N1—C2116.73 (14)O6—C15—H15B109.5
C3—N1—C6120.95 (12)H15A—C15—H15B109.5
C2—N1—C6121.87 (11)O6—C15—H15C109.5
C3—N2—C4116.26 (12)H15A—C15—H15C109.5
C18—O3—C19117.21 (13)H15B—C15—H15C109.5
C24—O4—C27117.49 (12)O7—C16—H16A109.5
C10—O5—C14116.92 (13)O7—C16—H16B109.5
C11—O6—C15120.08 (12)H16A—C16—H16B109.5
C12—O7—C16117.54 (13)O7—C16—H16C109.5
C7—C1—C2119.69 (13)H16A—C16—H16C109.5
C7—C1—S1129.97 (13)H16B—C16—H16C109.5
C2—C1—S1110.26 (11)C4—C17—H17A109.5
O1—C2—N1122.85 (15)C4—C17—H17B109.5
O1—C2—C1127.13 (15)H17A—C17—H17B109.5
N1—C2—C1110.02 (12)C4—C17—H17C109.5
N2—C3—N1126.15 (15)H17A—C17—H17C109.5
N2—C3—S1122.60 (11)H17B—C17—H17C109.5
N1—C3—S1111.22 (11)O2—C18—O3122.02 (15)
C5—C4—N2122.62 (14)O2—C18—C5128.08 (14)
C5—C4—C17124.96 (16)O3—C18—C5109.89 (13)
N2—C4—C17112.40 (13)O3—C19—C20107.07 (15)
C4—C5—C18123.03 (14)O3—C19—H19A110.3
C4—C5—C6121.00 (15)C20—C19—H19A110.3
C18—C5—C6115.96 (12)O3—C19—H19B110.3
N1—C6—C5108.39 (12)C20—C19—H19B110.3
N1—C6—C21110.15 (13)H19A—C19—H19B108.6
C5—C6—C21114.06 (12)C19—C20—H20A109.5
N1—C6—H6108.0C19—C20—H20B109.5
C5—C6—H6108.0H20A—C20—H20B109.5
C21—C6—H6108.0C19—C20—H20C109.5
C1—C7—C8131.59 (13)H20A—C20—H20C109.5
C1—C7—H7114.2H20B—C20—H20C109.5
C8—C7—H7114.2C22—C21—C26118.61 (14)
C13—C8—C9118.62 (15)C22—C21—C6121.88 (12)
C13—C8—C7116.98 (13)C26—C21—C6119.49 (13)
C9—C8—C7124.36 (14)C21—C22—C23121.50 (13)
C10—C9—C8119.55 (14)C21—C22—H22119.2
C10—C9—H9120.2C23—C22—H22119.2
C8—C9—H9120.2C22—C23—C24119.01 (14)
O5—C10—C9125.01 (14)C22—C23—H23120.5
O5—C10—C11113.31 (14)C24—C23—H23120.5
C9—C10—C11121.69 (13)O4—C24—C25115.17 (13)
O6—C11—C12125.18 (14)O4—C24—C23124.71 (14)
O6—C11—C10116.08 (12)C25—C24—C23120.10 (15)
C12—C11—C10118.54 (15)C26—C25—C24120.12 (13)
O7—C12—C13124.32 (13)C26—C25—H25119.9
O7—C12—C11115.93 (15)C24—C25—H25119.9
C13—C12—C11119.73 (14)C25—C26—C21120.55 (14)
C12—C13—C8121.71 (13)C25—C26—H26119.7
C12—C13—H13119.1C21—C26—H26119.7
C8—C13—H13119.1O4—C27—H27A109.5
O5—C14—H14A109.5O4—C27—H27B109.5
O5—C14—H14B109.5H27A—C27—H27B109.5
H14A—C14—H14B109.5O4—C27—H27C109.5
O5—C14—H14C109.5H27A—C27—H27C109.5
H14A—C14—H14C109.5H27B—C27—H27C109.5
H14B—C14—H14C109.5
C3—S1—C1—C7178.36 (16)C8—C9—C10—C111.9 (2)
C3—S1—C1—C21.65 (12)C15—O6—C11—C1242.5 (2)
C3—N1—C2—O1178.34 (15)C15—O6—C11—C10142.70 (15)
C6—N1—C2—O19.4 (2)O5—C10—C11—O68.2 (2)
C3—N1—C2—C12.69 (19)C9—C10—C11—O6171.73 (14)
C6—N1—C2—C1169.60 (13)O5—C10—C11—C12176.62 (13)
C7—C1—C2—O12.0 (3)C9—C10—C11—C123.5 (2)
S1—C1—C2—O1179.09 (14)C16—O7—C12—C135.8 (2)
C7—C1—C2—N1176.92 (14)C16—O7—C12—C11175.85 (13)
S1—C1—C2—N10.18 (16)O6—C11—C12—O75.1 (2)
C4—N2—C3—N15.0 (2)C10—C11—C12—O7179.79 (13)
C4—N2—C3—S1172.73 (11)O6—C11—C12—C13173.40 (14)
C2—N1—C3—N2173.96 (15)C10—C11—C12—C131.3 (2)
C6—N1—C3—N213.7 (2)O7—C12—C13—C8175.95 (14)
C2—N1—C3—S13.99 (17)C11—C12—C13—C82.4 (2)
C6—N1—C3—S1168.38 (11)C9—C8—C13—C124.0 (2)
C1—S1—C3—N2174.90 (14)C7—C8—C13—C12173.80 (14)
C1—S1—C3—N13.13 (12)C19—O3—C18—O22.0 (2)
C3—N2—C4—C510.3 (2)C19—O3—C18—C5179.21 (13)
C3—N2—C4—C17168.19 (14)C4—C5—C18—O25.3 (3)
N2—C4—C5—C18177.23 (14)C6—C5—C18—O2174.66 (16)
C17—C4—C5—C181.1 (3)C4—C5—C18—O3175.97 (14)
N2—C4—C5—C62.8 (2)C6—C5—C18—O34.04 (19)
C17—C4—C5—C6178.91 (14)C18—O3—C19—C20163.14 (14)
C3—N1—C6—C523.72 (19)N1—C6—C21—C2271.70 (18)
C2—N1—C6—C5164.31 (13)C5—C6—C21—C2250.4 (2)
C3—N1—C6—C21101.71 (16)N1—C6—C21—C26106.86 (16)
C2—N1—C6—C2170.26 (17)C5—C6—C21—C26131.01 (15)
C4—C5—C6—N118.5 (2)C26—C21—C22—C232.7 (2)
C18—C5—C6—N1161.48 (13)C6—C21—C22—C23175.85 (15)
C4—C5—C6—C21104.57 (17)C21—C22—C23—C240.9 (2)
C18—C5—C6—C2175.42 (17)C27—O4—C24—C25177.30 (15)
C2—C1—C7—C8176.39 (16)C27—O4—C24—C231.3 (2)
S1—C1—C7—C80.1 (3)C22—C23—C24—O4176.48 (15)
C1—C7—C8—C13162.98 (17)C22—C23—C24—C252.1 (2)
C1—C7—C8—C914.6 (3)O4—C24—C25—C26175.59 (15)
C13—C8—C9—C101.8 (2)C23—C24—C25—C263.1 (3)
C7—C8—C9—C10175.79 (15)C24—C25—C26—C211.2 (3)
C14—O5—C10—C95.4 (2)C22—C21—C26—C251.7 (2)
C14—O5—C10—C11174.66 (13)C6—C21—C26—C25176.93 (15)
C8—C9—C10—O5178.22 (14)
references
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Liu, X.-G., Feng, Y.-Q., Li, X.-F. & Gao, B. (2004a). Acta Cryst. E60, o464–o465.

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Monks, A., Scudiero, D., Skehan, P., Shoemaker, R., Paull, K., Vistica, D., Hose, C., Langley, J., Cronise, P., Vaigro-Wolff, A., Gray-Goodrich, M., Campbell, H., Mayo, J. & Boyd, M. (1991). J. Natl Cancer Inst. 83, 757–766.

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