organic compounds
N-{[2,5-Dichloro-4-(1,1,2,3,3,3-hexafluoropropoxy)phenyl]aminocarbonyl}-2,6-difluorobenzamide
aDepartment of Applied Chemistry, College of Science, Nanjing University of Technology, Xinmofan Road No. 5, Nanjing 210009, People's Republic of China
*Correspondence e-mail: fangshi.li@njut.edu.cn
In the molecule of the title compound, C17H8Cl2F8N2O3, the two aromatic rings are oriented at a dihedral angle of 50.12 (3)°. Intramolecular N—H⋯O, C—H⋯O and N—H⋯Cl hydrogen bonds result in the formation of two six- and one five-membered rings. The six-membered rings have flattened-boat conformations, while the five-membered ring adopts an In the intermolecular N—H⋯O hydrogen bonds link the molecules into centrosymmetric dimers.
Related literature
For related literature, see: Drabek & Boeger (1986). For bond-length data, see: Allen et al. (1987). For ring conformation puckering parameters, see: Cremer & Pople (1975).
Experimental
Crystal data
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Refinement
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Data collection: CAD-4 Software (Enraf–Nonius, 1989); cell CAD-4 Software; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supporting information
10.1107/S1600536808025506/hk2510sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536808025506/hk2510Isup2.hkl
The title compound was prepared according to the literature method (Drabek & Boeger, 1986). The crystals suitable for X-ray analysis were obtained by dissolving the title compound (0.3 g) in acetonitrile (25 ml) and evaporating the solvent slowly at room temperature for about 8 d.
H atoms were positioned geometrically, with N-H = 0.86 Å (for NH) and C-H = 0.93 and 0.98 Å for aromatic and methine H, respectively, and constrained to ride on their parent atoms with Uiso(H) = 1.2Ueq(C,N).
Data collection: CAD-4 Software (Enraf–Nonius, 1989); cell
CAD-4 Software (Enraf–Nonius, 1989); data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).C17H8Cl2F8N2O3 | F(000) = 1016 |
Mr = 511.15 | Dx = 1.683 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 25 reflections |
a = 9.2300 (18) Å | θ = 9–12° |
b = 16.404 (3) Å | µ = 0.42 mm−1 |
c = 14.074 (3) Å | T = 294 K |
β = 108.77 (3)° | Block, colorless |
V = 2017.6 (8) Å3 | 0.40 × 0.30 × 0.20 mm |
Z = 4 |
Enraf–Nonius CAD-4 diffractometer | 1922 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.000 |
Graphite monochromator | θmax = 25.2°, θmin = 2.0° |
ω/2θ scans | h = −11→10 |
Absorption correction: ψ scan (North et al., 1968) | k = 0→19 |
Tmin = 0.851, Tmax = 0.921 | l = 0→16 |
3609 measured reflections | 3 standard reflections every 200 reflections |
3609 independent reflections | intensity decay: none |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.086 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.248 | H-atom parameters constrained |
S = 1.09 | w = 1/[σ2(Fo2) + (0.1258P)2 + 1.1819P] where P = (Fo2 + 2Fc2)/3 |
3609 reflections | (Δ/σ)max = 0.001 |
283 parameters | Δρmax = 0.42 e Å−3 |
96 restraints | Δρmin = −0.35 e Å−3 |
C17H8Cl2F8N2O3 | V = 2017.6 (8) Å3 |
Mr = 511.15 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 9.2300 (18) Å | µ = 0.42 mm−1 |
b = 16.404 (3) Å | T = 294 K |
c = 14.074 (3) Å | 0.40 × 0.30 × 0.20 mm |
β = 108.77 (3)° |
Enraf–Nonius CAD-4 diffractometer | 1922 reflections with I > 2σ(I) |
Absorption correction: ψ scan (North et al., 1968) | Rint = 0.000 |
Tmin = 0.851, Tmax = 0.921 | 3 standard reflections every 200 reflections |
3609 measured reflections | intensity decay: none |
3609 independent reflections |
R[F2 > 2σ(F2)] = 0.086 | 96 restraints |
wR(F2) = 0.248 | H-atom parameters constrained |
S = 1.09 | Δρmax = 0.42 e Å−3 |
3609 reflections | Δρmin = −0.35 e Å−3 |
283 parameters |
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 > 2sigma(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. |
x | y | z | Uiso*/Ueq | ||
Cl1 | 1.21022 (15) | 1.15534 (9) | 0.61828 (12) | 0.0527 (5) | |
Cl2 | 1.06547 (19) | 0.83402 (11) | 0.80001 (17) | 0.0914 (8) | |
F1 | 0.4001 (5) | 0.7889 (3) | 0.7184 (3) | 0.0975 (16) | |
F2 | 0.4224 (4) | 0.8023 (3) | 0.3906 (3) | 0.0810 (13) | |
F3 | 1.5260 (5) | 1.0359 (3) | 0.6887 (5) | 0.1116 (18) | |
F4 | 1.5722 (4) | 0.9618 (3) | 0.8001 (4) | 0.1039 (17) | |
F5 | 1.8146 (6) | 1.0579 (3) | 0.7942 (5) | 0.145 (3) | |
F6 | 1.8127 (6) | 1.0156 (3) | 0.9703 (4) | 0.1121 (18) | |
F7 | 1.9281 (6) | 1.1152 (3) | 0.9350 (4) | 0.119 (2) | |
F8 | 1.6616 (6) | 1.1347 (3) | 0.9601 (4) | 0.1029 (15) | |
O1 | 0.6850 (4) | 0.7921 (2) | 0.6546 (4) | 0.0703 (15) | |
O2 | 0.6981 (4) | 1.0216 (3) | 0.5376 (3) | 0.0505 (11) | |
O3 | 1.4248 (4) | 1.0694 (3) | 0.7916 (4) | 0.0758 (16) | |
N1 | 0.5870 (4) | 0.9045 (2) | 0.5577 (3) | 0.0359 (11) | |
H1A | 0.5033 | 0.9242 | 0.5175 | 0.043* | |
N2 | 0.8483 (4) | 0.9219 (2) | 0.6377 (3) | 0.0327 (10) | |
H2A | 0.8468 | 0.8724 | 0.6576 | 0.039* | |
C1 | 0.1954 (8) | 0.7296 (5) | 0.5816 (6) | 0.074 (2) | |
H1B | 0.1414 | 0.7140 | 0.6242 | 0.089* | |
C2 | 0.1405 (7) | 0.7183 (4) | 0.4832 (5) | 0.0588 (17) | |
H2B | 0.0444 | 0.6945 | 0.4569 | 0.071* | |
C3 | 0.2142 (7) | 0.7389 (4) | 0.4199 (5) | 0.0607 (17) | |
H3A | 0.1704 | 0.7275 | 0.3519 | 0.073* | |
C4 | 0.3505 (6) | 0.7758 (4) | 0.4526 (4) | 0.0450 (14) | |
C5 | 0.4228 (6) | 0.7893 (3) | 0.5551 (4) | 0.0435 (14) | |
C6 | 0.3397 (7) | 0.7666 (4) | 0.6175 (5) | 0.0568 (16) | |
C7 | 0.5790 (6) | 0.8247 (3) | 0.5960 (4) | 0.0437 (14) | |
C8 | 0.7151 (6) | 0.9534 (3) | 0.5785 (4) | 0.0407 (14) | |
C9 | 0.9852 (5) | 0.9614 (3) | 0.6689 (4) | 0.0330 (12) | |
C10 | 1.0214 (5) | 1.0332 (3) | 0.6291 (4) | 0.0368 (12) | |
H10A | 0.9477 | 1.0595 | 0.5770 | 0.044* | |
C11 | 1.1661 (5) | 1.0655 (3) | 0.6667 (4) | 0.0355 (12) | |
C12 | 1.2807 (6) | 1.0310 (4) | 0.7494 (5) | 0.0518 (16) | |
C13 | 1.2445 (7) | 0.9591 (4) | 0.7901 (5) | 0.0572 (17) | |
H13A | 1.3159 | 0.9350 | 0.8453 | 0.069* | |
C14 | 1.1065 (5) | 0.9252 (3) | 0.7492 (4) | 0.0391 (13) | |
C15 | 1.5460 (7) | 1.0386 (4) | 0.8024 (7) | 0.079 (3) | |
C16 | 1.6854 (8) | 1.0845 (5) | 0.8271 (9) | 0.107 (4) | |
H16A | 1.6576 | 1.1394 | 0.7999 | 0.129* | |
C17 | 1.7772 (11) | 1.0946 (6) | 0.9319 (7) | 0.089 |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0401 (8) | 0.0436 (9) | 0.0782 (11) | −0.0152 (6) | 0.0242 (7) | −0.0007 (7) |
Cl2 | 0.0513 (10) | 0.0599 (12) | 0.1330 (18) | −0.0100 (8) | −0.0123 (10) | 0.0497 (12) |
F1 | 0.097 (3) | 0.135 (4) | 0.051 (3) | −0.054 (3) | 0.010 (2) | 0.026 (2) |
F2 | 0.086 (3) | 0.103 (3) | 0.059 (3) | −0.045 (3) | 0.030 (2) | −0.034 (2) |
F3 | 0.099 (4) | 0.106 (4) | 0.133 (5) | −0.034 (3) | 0.041 (3) | −0.032 (3) |
F4 | 0.054 (2) | 0.072 (3) | 0.172 (5) | −0.010 (2) | 0.019 (3) | −0.015 (3) |
F5 | 0.092 (3) | 0.141 (5) | 0.225 (7) | −0.023 (3) | 0.082 (4) | −0.111 (5) |
F6 | 0.127 (4) | 0.104 (4) | 0.095 (4) | −0.017 (3) | 0.021 (3) | 0.052 (3) |
F7 | 0.099 (3) | 0.083 (3) | 0.116 (4) | −0.024 (3) | −0.048 (3) | 0.006 (3) |
F8 | 0.097 (3) | 0.111 (4) | 0.103 (4) | −0.001 (3) | 0.034 (3) | −0.012 (3) |
O1 | 0.029 (2) | 0.047 (3) | 0.107 (4) | 0.0006 (18) | −0.017 (2) | 0.037 (2) |
O2 | 0.046 (2) | 0.047 (3) | 0.057 (3) | −0.0033 (19) | 0.013 (2) | −0.005 (2) |
O3 | 0.035 (2) | 0.043 (3) | 0.129 (5) | −0.009 (2) | −0.001 (2) | 0.009 (3) |
N1 | 0.028 (2) | 0.019 (2) | 0.058 (3) | 0.0007 (17) | 0.009 (2) | 0.0093 (19) |
N2 | 0.028 (2) | 0.025 (2) | 0.043 (3) | −0.0005 (17) | 0.0085 (19) | −0.0044 (19) |
C1 | 0.070 (4) | 0.082 (5) | 0.076 (4) | −0.028 (4) | 0.032 (4) | 0.017 (4) |
C2 | 0.046 (3) | 0.051 (4) | 0.071 (4) | −0.016 (3) | 0.007 (3) | 0.003 (3) |
C3 | 0.059 (4) | 0.061 (4) | 0.051 (4) | −0.023 (3) | 0.002 (3) | −0.014 (3) |
C4 | 0.045 (3) | 0.046 (3) | 0.042 (3) | −0.003 (3) | 0.011 (3) | −0.004 (3) |
C5 | 0.039 (3) | 0.042 (3) | 0.047 (3) | −0.006 (2) | 0.011 (2) | 0.010 (3) |
C6 | 0.044 (3) | 0.067 (4) | 0.053 (4) | −0.009 (3) | 0.007 (3) | 0.014 (3) |
C7 | 0.045 (3) | 0.039 (3) | 0.047 (4) | −0.010 (3) | 0.016 (3) | 0.004 (3) |
C8 | 0.037 (3) | 0.027 (3) | 0.051 (4) | 0.000 (2) | 0.005 (3) | 0.009 (3) |
C9 | 0.026 (2) | 0.036 (3) | 0.036 (3) | 0.000 (2) | 0.009 (2) | −0.005 (2) |
C10 | 0.032 (2) | 0.040 (3) | 0.042 (3) | −0.007 (2) | 0.016 (2) | −0.003 (2) |
C11 | 0.033 (3) | 0.035 (3) | 0.044 (3) | −0.009 (2) | 0.020 (2) | 0.008 (2) |
C12 | 0.030 (3) | 0.053 (4) | 0.065 (4) | −0.003 (2) | 0.006 (3) | 0.004 (3) |
C13 | 0.042 (3) | 0.051 (4) | 0.071 (4) | 0.013 (3) | 0.007 (3) | 0.017 (3) |
C14 | 0.022 (2) | 0.042 (3) | 0.049 (3) | 0.012 (2) | 0.005 (2) | 0.009 (2) |
C15 | 0.029 (3) | 0.050 (5) | 0.142 (8) | 0.006 (3) | 0.007 (4) | −0.014 (4) |
C16 | 0.041 (4) | 0.046 (4) | 0.219 (11) | −0.009 (3) | 0.021 (5) | 0.007 (6) |
C17 | 0.080 | 0.089 | 0.096 | −0.006 | 0.026 | 0.004 |
Cl1—C11 | 1.727 (5) | C2—C3 | 1.326 (9) |
Cl2—C14 | 1.751 (6) | C2—H2B | 0.9300 |
F1—C6 | 1.398 (7) | O3—C15 | 1.191 (7) |
F2—C4 | 1.327 (7) | O3—C12 | 1.418 (6) |
F3—C15 | 1.552 (10) | C3—C4 | 1.338 (8) |
F4—C15 | 1.284 (8) | C3—H3A | 0.9300 |
F5—C16 | 1.477 (9) | C4—C5 | 1.399 (8) |
F6—C17 | 1.403 (10) | C5—C6 | 1.389 (8) |
F7—C17 | 1.420 (10) | C5—C7 | 1.488 (7) |
F8—C17 | 1.415 (10) | C9—C10 | 1.390 (7) |
O1—C7 | 1.186 (6) | C9—C14 | 1.439 (7) |
N1—C8 | 1.380 (6) | C10—C11 | 1.374 (7) |
N1—C7 | 1.427 (7) | C10—H10A | 0.9300 |
N1—H1A | 0.8600 | C11—C12 | 1.414 (7) |
C1—C2 | 1.327 (10) | C12—C13 | 1.398 (8) |
C1—C6 | 1.401 (9) | C13—C14 | 1.338 (8) |
C1—H1B | 0.9300 | C13—H13A | 0.9300 |
N2—C8 | 1.347 (6) | C15—C16 | 1.434 (9) |
N2—C9 | 1.361 (6) | C16—C17 | 1.455 (13) |
N2—H2A | 0.8600 | C16—H16A | 0.9800 |
O2—C8 | 1.245 (6) | ||
C8—N1—C7 | 126.7 (4) | C11—C10—C9 | 120.1 (5) |
C8—N1—H1A | 116.6 | C11—C10—H10A | 120.0 |
C7—N1—H1A | 116.6 | C9—C10—H10A | 120.0 |
C2—C1—C6 | 115.8 (6) | C10—C11—C12 | 122.7 (5) |
C2—C1—H1B | 122.1 | C10—C11—Cl1 | 120.0 (4) |
C6—C1—H1B | 122.1 | C12—C11—Cl1 | 117.2 (4) |
C8—N2—C9 | 125.8 (4) | C13—C12—C11 | 117.4 (5) |
C8—N2—H2A | 117.1 | C13—C12—O3 | 121.2 (5) |
C9—N2—H2A | 117.1 | C11—C12—O3 | 121.4 (5) |
C1—C2—C3 | 124.0 (6) | C14—C13—C12 | 119.7 (5) |
C1—C2—H2B | 118.0 | C14—C13—H13A | 120.2 |
C3—C2—H2B | 118.0 | C12—C13—H13A | 120.2 |
C15—O3—C12 | 125.5 (6) | C13—C14—C9 | 123.9 (5) |
C2—C3—C4 | 120.9 (6) | C13—C14—Cl2 | 118.8 (4) |
C2—C3—H3A | 119.6 | C9—C14—Cl2 | 117.2 (4) |
C4—C3—H3A | 119.6 | O3—C15—F4 | 126.1 (6) |
F2—C4—C3 | 122.4 (6) | O3—C15—C16 | 122.7 (7) |
F2—C4—C5 | 117.0 (5) | F4—C15—C16 | 111.1 (6) |
C3—C4—C5 | 120.7 (6) | O3—C15—F3 | 94.9 (6) |
C6—C5—C4 | 115.6 (5) | F4—C15—F3 | 84.7 (6) |
C6—C5—C7 | 121.6 (5) | C16—C15—F3 | 93.7 (7) |
C4—C5—C7 | 122.8 (5) | C15—C16—C17 | 119.4 (9) |
C5—C6—F1 | 116.8 (5) | C15—C16—F5 | 121.4 (7) |
C5—C6—C1 | 122.9 (6) | C17—C16—F5 | 94.9 (6) |
F1—C6—C1 | 120.1 (6) | C15—C16—H16A | 106.6 |
O1—C7—N1 | 123.1 (5) | C17—C16—H16A | 106.6 |
O1—C7—C5 | 125.0 (5) | F5—C16—H16A | 106.6 |
N1—C7—C5 | 111.9 (5) | F6—C17—F8 | 115.2 (7) |
O2—C8—N2 | 125.8 (5) | F6—C17—F7 | 95.9 (6) |
O2—C8—N1 | 116.9 (4) | F8—C17—F7 | 134.6 (8) |
N2—C8—N1 | 117.2 (5) | F6—C17—C16 | 105.8 (7) |
N2—C9—C10 | 126.3 (5) | F8—C17—C16 | 95.3 (7) |
N2—C9—C14 | 117.6 (5) | F7—C17—C16 | 107.7 (7) |
C10—C9—C14 | 116.0 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2A···Cl2 | 0.86 | 2.43 | 2.892 (4) | 115 |
N2—H2A···O1 | 0.86 | 1.98 | 2.664 (6) | 135 |
N1—H1A···O2i | 0.86 | 1.98 | 2.814 (6) | 163 |
C10—H10A···O2 | 0.93 | 2.28 | 2.851 (6) | 119 |
Symmetry code: (i) −x+1, −y+2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C17H8Cl2F8N2O3 |
Mr | 511.15 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 294 |
a, b, c (Å) | 9.2300 (18), 16.404 (3), 14.074 (3) |
β (°) | 108.77 (3) |
V (Å3) | 2017.6 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.42 |
Crystal size (mm) | 0.40 × 0.30 × 0.20 |
Data collection | |
Diffractometer | Enraf–Nonius CAD-4 diffractometer |
Absorption correction | ψ scan (North et al., 1968) |
Tmin, Tmax | 0.851, 0.921 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 3609, 3609, 1922 |
Rint | 0.000 |
(sin θ/λ)max (Å−1) | 0.598 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.086, 0.248, 1.09 |
No. of reflections | 3609 |
No. of parameters | 283 |
No. of restraints | 96 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.42, −0.35 |
Computer programs: CAD-4 Software (Enraf–Nonius, 1989), XCAD4 (Harms & Wocadlo, 1995), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2A···Cl2 | 0.86 | 2.43 | 2.892 (4) | 114.7 |
N2—H2A···O1 | 0.86 | 1.98 | 2.664 (6) | 135.4 |
N1—H1A···O2i | 0.86 | 1.98 | 2.814 (6) | 163.2 |
C10—H10A···O2 | 0.93 | 2.28 | 2.851 (6) | 119.0 |
Symmetry code: (i) −x+1, −y+2, −z+1. |
References
Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans. 2, pp. S1–19. CrossRef Web of Science Google Scholar
Cremer, D. & Pople, J. A. (1975). J. Am. Chem. Soc. 97, 1354–1358. CrossRef CAS Web of Science Google Scholar
Drabek, J. & Boeger, M. (1986). European Patent No. 179022. Google Scholar
Enraf–Nonius (1989). CAD-4 Software. Enraf–Nonius, Delft, The Netherlands. Google Scholar
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. CrossRef IUCr Journals Google Scholar
Harms, K. & Wocadlo, S. (1995). XCAD4. University of Marburg, Germany. Google Scholar
North, A. C. T., Phillips, D. C. & Mathews, F. S. (1968). Acta Cryst. A24, 351–359. CrossRef IUCr Journals Web of Science Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The title compound is considered to belong to the fourth generation of insectides with properties such as high selectivity, low acute toxicity for mammals and high biological activity. It is generally recognized as a chitin-synthesis inhibitor that interrupts chitin-synthesis during the development and reproduction of the insectide. As part of our studies in this area, we report herein the crystal structure of the title compound.
In the molecule of the title compound, (Fig. 1) the bond lengths (Allen et al., 1987) and angles are within normal ranges. Rings A (C1-C6) and B (C9-C14) are, of course, planar, and the dihedral angle between them is A/B = 50.12 (3)°. The intramolecular N-H···O, C-H···O and N-H···Cl hydrogen bonds (Table 1) result in the formation of two six- and one five-membered non-planar rings: C (O1/N1/N2/C7/C8/H2A), D (O2/N2/C8-C10/H10A) and E (Cl2/N2/C9/C14/H2A). Rings C and D adopt twisted [ϕ = -169.19 (2)°, θ = 21.09 (3)° (for ring C) and ϕ = 178.48 (3)°, θ = 127.74 (3)° (for ring D)] conformations, having total puckering amplitudes, QT, of 0.113 (3) and 0.201 (3) Å, respectively (Cremer & Pople, 1975). Ring E adopts envelope conformation, with H2A atom displaced by 0.190 (3) Å from the plane of the other ring atoms.
In the crystal structure, intermolecular N-H···O hydrogen bonds (Table 1) link the molecules into centrosymmetric dimers (Fig. 2), in which they may be effective in the stabilization of the structure.