organic compounds
Ethyl N-(2-benzoyl-4-chlorophenyl)ethanecarboximidate
aDepartment of Studies in Chemistry, University of Mysore, Mysore 570 006, India, and bDepartment of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
*Correspondence e-mail: mkubicki@amu.edu.pl
In the title compound, C17H16ClNO2, the N=C—O—C—C fragment is planar within 0.029 (1) Å, and makes dihedral angles of 66.71 (8) and 59.61 (8)° with the planes of the chlorophenyl and benzoyl rings, respectively. The carbonyl C=O bond is not coplanar with either of the aromatic rings; it makes angles of 42.5 and 23.5° with the normals to the ring planes. In the crystal, very weak C—H⋯O, C—H⋯Cl, C—H⋯π and π–π [interplanar distance = 3.53 (1) Å] interactions are observed.
Related literature
For background to the medical applications of benzophenones, see, for instance: Evans et al. (1987); Revesz et al. (2004); Wiesner et al. (2002); Zeng et al. (2010). A similar structure has been described by Derieg et al. (1970)
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis PRO (Agilent, 2011); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536812007763/nk2143sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812007763/nk2143Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812007763/nk2143Isup3.cml
The title compound was obtained as a gift sample from R. L. Fine Chem., Bengaluru, India. The compound was recrystallized from dichloromethane by slow evaporation (m.p: 323 K).
Hydrogen atoms were put in the idealized positions, and refined as riding model. Their isotropic thermal parameters were set at 1.2 times Ueq's of appropriate carrier atoms.
Data collection: CrysAlis PRO (Agilent, 2011); cell
CrysAlis PRO (Agilent, 2011); data reduction: CrysAlis PRO (Agilent, 2011); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. Anisotropic ellipsoid representation of 1, drawn at 50% probability level. | |
Fig. 2. The crystal packing as seen approximately along the a-axis direction. Weak C—H···Cl hydrogen bonds are depicted as dashed lines. |
C17H16ClNO2 | Z = 2 |
Mr = 301.76 | F(000) = 316 |
Triclinic, P1 | Dx = 1.301 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.7107 Å |
a = 7.9674 (11) Å | Cell parameters from 1885 reflections |
b = 8.6993 (17) Å | θ = 2.9–27.8° |
c = 11.596 (2) Å | µ = 0.25 mm−1 |
α = 104.499 (17)° | T = 295 K |
β = 94.871 (14)° | Block, colourless |
γ = 95.001 (14)° | 0.35 × 0.2 × 0.15 mm |
V = 770.4 (2) Å3 |
Agilent Xcalibur Eos diffractometer | 3377 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 2455 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
Detector resolution: 16.1544 pixels mm-1 | θmax = 28.2°, θmin = 3.0° |
ω–scan | h = −10→10 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) | k = −11→11 |
Tmin = 0.991, Tmax = 1.000 | l = −15→15 |
13278 measured reflections |
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)] = 0.044 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.117 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0479P)2 + 0.1642P] where P = (Fo2 + 2Fc2)/3 |
3377 reflections | (Δ/σ)max = 0.001 |
192 parameters | Δρmax = 0.20 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
C17H16ClNO2 | γ = 95.001 (14)° |
Mr = 301.76 | V = 770.4 (2) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.9674 (11) Å | Mo Kα radiation |
b = 8.6993 (17) Å | µ = 0.25 mm−1 |
c = 11.596 (2) Å | T = 295 K |
α = 104.499 (17)° | 0.35 × 0.2 × 0.15 mm |
β = 94.871 (14)° |
Agilent Xcalibur Eos diffractometer | 3377 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) | 2455 reflections with I > 2σ(I) |
Tmin = 0.991, Tmax = 1.000 | Rint = 0.028 |
13278 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.117 | H-atom parameters constrained |
S = 1.05 | Δρmax = 0.20 e Å−3 |
3377 reflections | Δρmin = −0.21 e Å−3 |
192 parameters |
Experimental. Address for R L Fine Chemicals: No 15, R L Fine Chem, KHB Industrial Area, Yelahanka New Town, Bengaluru-560 106, India. Website: http://www.rlfinechem.com |
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. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.7628 (2) | 0.41768 (19) | 0.70454 (14) | 0.0376 (4) | |
C2 | 0.6659 (2) | 0.33697 (19) | 0.77071 (14) | 0.0361 (4) | |
C3 | 0.5286 (2) | 0.4041 (2) | 0.82141 (15) | 0.0411 (4) | |
H3 | 0.4601 | 0.3484 | 0.8619 | 0.049* | |
C4 | 0.4940 (2) | 0.5531 (2) | 0.81170 (15) | 0.0422 (4) | |
Cl4 | 0.32629 (7) | 0.63863 (7) | 0.87998 (5) | 0.0670 (2) | |
C5 | 0.5910 (2) | 0.6367 (2) | 0.74955 (16) | 0.0464 (4) | |
H5 | 0.5671 | 0.7374 | 0.7439 | 0.056* | |
C6 | 0.7238 (2) | 0.5683 (2) | 0.69612 (16) | 0.0463 (4) | |
H6 | 0.7890 | 0.6236 | 0.6535 | 0.056* | |
N11 | 0.90172 (18) | 0.34957 (17) | 0.65447 (13) | 0.0428 (4) | |
C12 | 0.9091 (2) | 0.3070 (2) | 0.54356 (16) | 0.0432 (4) | |
C13 | 0.7813 (3) | 0.3131 (3) | 0.44432 (18) | 0.0663 (6) | |
H13A | 0.6819 | 0.3528 | 0.4768 | 0.099* | |
H13B | 0.7517 | 0.2077 | 0.3923 | 0.099* | |
H13C | 0.8278 | 0.3828 | 0.3997 | 0.099* | |
O14 | 1.04660 (16) | 0.24308 (16) | 0.50072 (10) | 0.0514 (3) | |
C15 | 1.1748 (3) | 0.2175 (3) | 0.58734 (18) | 0.0611 (6) | |
H15A | 1.1248 | 0.1528 | 0.6353 | 0.073* | |
H15B | 1.2242 | 0.3191 | 0.6404 | 0.073* | |
C16 | 1.3068 (3) | 0.1356 (3) | 0.5231 (2) | 0.0828 (8) | |
H16A | 1.2558 | 0.0387 | 0.4668 | 0.124* | |
H16B | 1.3885 | 0.1107 | 0.5794 | 0.124* | |
H16C | 1.3621 | 0.2040 | 0.4810 | 0.124* | |
C21 | 0.7012 (2) | 0.1754 (2) | 0.78588 (15) | 0.0398 (4) | |
O22 | 0.58787 (18) | 0.06586 (16) | 0.76157 (14) | 0.0632 (4) | |
C23 | 0.8739 (2) | 0.15418 (19) | 0.83424 (14) | 0.0368 (4) | |
C24 | 0.9812 (2) | 0.2816 (2) | 0.90603 (16) | 0.0455 (4) | |
H24 | 0.9479 | 0.3840 | 0.9217 | 0.055* | |
C25 | 1.1373 (3) | 0.2576 (3) | 0.95454 (18) | 0.0587 (5) | |
H25 | 1.2078 | 0.3432 | 1.0049 | 0.070* | |
C26 | 1.1892 (3) | 0.1075 (3) | 0.9288 (2) | 0.0655 (6) | |
H26 | 1.2951 | 0.0917 | 0.9613 | 0.079* | |
C27 | 1.0850 (3) | −0.0190 (3) | 0.8554 (2) | 0.0672 (6) | |
H27 | 1.1214 | −0.1202 | 0.8365 | 0.081* | |
C28 | 0.9271 (3) | 0.0033 (2) | 0.80965 (18) | 0.0533 (5) | |
H28 | 0.8554 | −0.0835 | 0.7619 | 0.064* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0369 (9) | 0.0398 (9) | 0.0377 (9) | 0.0072 (7) | 0.0026 (7) | 0.0122 (7) |
C2 | 0.0353 (9) | 0.0371 (8) | 0.0365 (8) | 0.0070 (7) | 0.0002 (7) | 0.0111 (7) |
C3 | 0.0375 (9) | 0.0466 (10) | 0.0428 (9) | 0.0092 (8) | 0.0051 (8) | 0.0165 (8) |
C4 | 0.0411 (10) | 0.0466 (10) | 0.0420 (9) | 0.0175 (8) | 0.0043 (8) | 0.0133 (8) |
Cl4 | 0.0666 (4) | 0.0787 (4) | 0.0720 (4) | 0.0447 (3) | 0.0256 (3) | 0.0314 (3) |
C5 | 0.0540 (11) | 0.0403 (9) | 0.0498 (10) | 0.0164 (9) | 0.0026 (9) | 0.0181 (8) |
C6 | 0.0505 (11) | 0.0437 (10) | 0.0520 (10) | 0.0090 (9) | 0.0088 (9) | 0.0235 (8) |
N11 | 0.0417 (8) | 0.0502 (9) | 0.0418 (8) | 0.0141 (7) | 0.0086 (7) | 0.0174 (7) |
C12 | 0.0384 (10) | 0.0510 (10) | 0.0443 (10) | 0.0086 (8) | 0.0075 (8) | 0.0175 (8) |
C13 | 0.0553 (13) | 0.0958 (17) | 0.0489 (11) | 0.0261 (12) | 0.0009 (10) | 0.0165 (11) |
O14 | 0.0427 (7) | 0.0750 (9) | 0.0404 (7) | 0.0197 (7) | 0.0082 (6) | 0.0165 (6) |
C15 | 0.0527 (12) | 0.0842 (15) | 0.0502 (11) | 0.0284 (11) | 0.0031 (10) | 0.0184 (10) |
C16 | 0.0640 (15) | 0.118 (2) | 0.0739 (15) | 0.0435 (15) | 0.0100 (13) | 0.0262 (15) |
C21 | 0.0429 (10) | 0.0360 (9) | 0.0418 (9) | 0.0070 (8) | 0.0063 (8) | 0.0112 (7) |
O22 | 0.0490 (8) | 0.0447 (7) | 0.0956 (11) | −0.0023 (7) | −0.0048 (8) | 0.0242 (7) |
C23 | 0.0421 (10) | 0.0353 (8) | 0.0375 (9) | 0.0108 (7) | 0.0074 (7) | 0.0145 (7) |
C24 | 0.0478 (11) | 0.0410 (9) | 0.0480 (10) | 0.0105 (8) | 0.0025 (9) | 0.0114 (8) |
C25 | 0.0486 (12) | 0.0701 (14) | 0.0584 (12) | 0.0067 (10) | −0.0065 (10) | 0.0223 (10) |
C26 | 0.0476 (12) | 0.0906 (17) | 0.0721 (14) | 0.0281 (12) | 0.0055 (11) | 0.0404 (13) |
C27 | 0.0729 (15) | 0.0616 (13) | 0.0798 (15) | 0.0405 (13) | 0.0148 (13) | 0.0286 (12) |
C28 | 0.0621 (13) | 0.0387 (10) | 0.0623 (12) | 0.0166 (9) | 0.0062 (10) | 0.0154 (9) |
C1—C2 | 1.398 (2) | C15—C16 | 1.472 (3) |
C1—C6 | 1.398 (2) | C15—H15A | 0.9700 |
C1—N11 | 1.402 (2) | C15—H15B | 0.9700 |
C2—C3 | 1.390 (2) | C16—H16A | 0.9600 |
C2—C21 | 1.506 (2) | C16—H16B | 0.9600 |
C3—C4 | 1.379 (2) | C16—H16C | 0.9600 |
C3—H3 | 0.9300 | C21—O22 | 1.214 (2) |
C4—C5 | 1.380 (3) | C21—C23 | 1.486 (2) |
C4—Cl4 | 1.7391 (17) | C23—C24 | 1.380 (2) |
C5—C6 | 1.376 (2) | C23—C28 | 1.383 (2) |
C5—H5 | 0.9300 | C24—C25 | 1.375 (3) |
C6—H6 | 0.9300 | C24—H24 | 0.9300 |
N11—C12 | 1.254 (2) | C25—C26 | 1.373 (3) |
C12—O14 | 1.348 (2) | C25—H25 | 0.9300 |
C12—C13 | 1.485 (3) | C26—C27 | 1.370 (3) |
C13—H13A | 0.9600 | C26—H26 | 0.9300 |
C13—H13B | 0.9600 | C27—C28 | 1.372 (3) |
C13—H13C | 0.9600 | C27—H27 | 0.9300 |
O14—C15 | 1.442 (2) | C28—H28 | 0.9300 |
C2—C1—C6 | 118.80 (15) | C16—C15—H15A | 109.9 |
C2—C1—N11 | 119.15 (14) | O14—C15—H15B | 109.9 |
C6—C1—N11 | 121.95 (16) | C16—C15—H15B | 109.9 |
C3—C2—C1 | 119.58 (15) | H15A—C15—H15B | 108.3 |
C3—C2—C21 | 118.18 (15) | C15—C16—H16A | 109.5 |
C1—C2—C21 | 122.20 (15) | C15—C16—H16B | 109.5 |
C4—C3—C2 | 120.03 (16) | H16A—C16—H16B | 109.5 |
C4—C3—H3 | 120.0 | C15—C16—H16C | 109.5 |
C2—C3—H3 | 120.0 | H16A—C16—H16C | 109.5 |
C3—C4—C5 | 121.20 (16) | H16B—C16—H16C | 109.5 |
C3—C4—Cl4 | 119.55 (14) | O22—C21—C23 | 120.95 (16) |
C5—C4—Cl4 | 119.25 (13) | O22—C21—C2 | 119.91 (16) |
C6—C5—C4 | 118.86 (16) | C23—C21—C2 | 119.12 (15) |
C6—C5—H5 | 120.6 | C24—C23—C28 | 119.14 (17) |
C4—C5—H5 | 120.6 | C24—C23—C21 | 121.28 (15) |
C5—C6—C1 | 121.44 (17) | C28—C23—C21 | 119.57 (16) |
C5—C6—H6 | 119.3 | C25—C24—C23 | 120.16 (17) |
C1—C6—H6 | 119.3 | C25—C24—H24 | 119.9 |
C12—N11—C1 | 122.68 (15) | C23—C24—H24 | 119.9 |
N11—C12—O14 | 119.97 (16) | C26—C25—C24 | 120.2 (2) |
N11—C12—C13 | 129.03 (17) | C26—C25—H25 | 119.9 |
O14—C12—C13 | 110.99 (15) | C24—C25—H25 | 119.9 |
C12—C13—H13A | 109.5 | C27—C26—C25 | 120.0 (2) |
C12—C13—H13B | 109.5 | C27—C26—H26 | 120.0 |
H13A—C13—H13B | 109.5 | C25—C26—H26 | 120.0 |
C12—C13—H13C | 109.5 | C26—C27—C28 | 120.08 (19) |
H13A—C13—H13C | 109.5 | C26—C27—H27 | 120.0 |
H13B—C13—H13C | 109.5 | C28—C27—H27 | 120.0 |
C12—O14—C15 | 116.82 (14) | C27—C28—C23 | 120.4 (2) |
O14—C15—C16 | 108.70 (17) | C27—C28—H28 | 119.8 |
O14—C15—H15A | 109.9 | C23—C28—H28 | 119.8 |
C6—C1—C2—C3 | 3.2 (2) | C13—C12—O14—C15 | −174.91 (18) |
N11—C1—C2—C3 | 179.56 (15) | C12—O14—C15—C16 | 175.44 (19) |
C6—C1—C2—C21 | −179.05 (16) | C3—C2—C21—O22 | 50.6 (2) |
N11—C1—C2—C21 | −2.6 (2) | C1—C2—C21—O22 | −127.22 (19) |
C1—C2—C3—C4 | −3.4 (2) | C3—C2—C21—C23 | −127.49 (17) |
C21—C2—C3—C4 | 178.69 (16) | C1—C2—C21—C23 | 54.7 (2) |
C2—C3—C4—C5 | 1.7 (3) | O22—C21—C23—C24 | −153.15 (17) |
C2—C3—C4—Cl4 | −177.78 (13) | C2—C21—C23—C24 | 24.9 (2) |
C3—C4—C5—C6 | 0.4 (3) | O22—C21—C23—C28 | 25.1 (3) |
Cl4—C4—C5—C6 | 179.81 (14) | C2—C21—C23—C28 | −156.77 (16) |
C4—C5—C6—C1 | −0.6 (3) | C28—C23—C24—C25 | −1.5 (3) |
C2—C1—C6—C5 | −1.2 (3) | C21—C23—C24—C25 | 176.78 (17) |
N11—C1—C6—C5 | −177.46 (16) | C23—C24—C25—C26 | 2.0 (3) |
C2—C1—N11—C12 | 116.53 (19) | C24—C25—C26—C27 | −0.5 (3) |
C6—C1—N11—C12 | −67.2 (2) | C25—C26—C27—C28 | −1.5 (3) |
C1—N11—C12—O14 | 179.59 (15) | C26—C27—C28—C23 | 2.0 (3) |
C1—N11—C12—C13 | −1.7 (3) | C24—C23—C28—C27 | −0.5 (3) |
N11—C12—O14—C15 | 4.1 (3) | C21—C23—C28—C27 | −178.80 (18) |
CgA denotes the centroid of the phenyl ring C1 - C6 |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···O22i | 0.93 | 2.80 | 3.704 (2) | 164 |
C6—H6···O14ii | 0.93 | 2.73 | 3.648 (2) | 172 |
C16—H16B···O22iii | 0.96 | 2.66 | 3.614 (3) | 171 |
C27—H27···Cl4iv | 0.93 | 2.88 | 3.739 (2) | 154 |
C25—H25···CgAv | 0.93 | 2.90 | 3.744 (3) | 151 |
Symmetry codes: (i) x, y+1, z; (ii) −x+2, −y+1, −z+1; (iii) x+1, y, z; (iv) x+1, y−1, z; (v) −x+2, −y+1, −z+2. |
Experimental details
Crystal data | |
Chemical formula | C17H16ClNO2 |
Mr | 301.76 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 295 |
a, b, c (Å) | 7.9674 (11), 8.6993 (17), 11.596 (2) |
α, β, γ (°) | 104.499 (17), 94.871 (14), 95.001 (14) |
V (Å3) | 770.4 (2) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.25 |
Crystal size (mm) | 0.35 × 0.2 × 0.15 |
Data collection | |
Diffractometer | Agilent Xcalibur Eos diffractometer |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2011) |
Tmin, Tmax | 0.991, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13278, 3377, 2455 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.664 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.117, 1.05 |
No. of reflections | 3377 |
No. of parameters | 192 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.20, −0.21 |
Computer programs: CrysAlis PRO (Agilent, 2011), SIR92 (Altomare et al., 1993), SHELXL97 (Sheldrick, 2008), XP (Sheldrick, 2008).
CgA denotes the centroid of the phenyl ring C1 - C6 |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···O22i | 0.93 | 2.80 | 3.704 (2) | 164 |
C6—H6···O14ii | 0.93 | 2.73 | 3.648 (2) | 172 |
C16—H16B···O22iii | 0.96 | 2.66 | 3.614 (3) | 171 |
C27—H27···Cl4iv | 0.93 | 2.88 | 3.739 (2) | 154 |
C25—H25···CgAv | 0.93 | 2.90 | 3.744 (3) | 151 |
Symmetry codes: (i) x, y+1, z; (ii) −x+2, −y+1, −z+1; (iii) x+1, y, z; (iv) x+1, y−1, z; (v) −x+2, −y+1, −z+2. |
Acknowledgements
ASD thanks the University of Mysore for research facilities. HSY thanks R. L. Fine Chem, Bengaluru, India, for the gift sample of the title compound.
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Benzophenone and related analogues have been reported to act as antiallergic, anti-inflammatory, antiasthamatic, antimalarial, anti-microbial and antianaphylactic agents (Evans et al., 1987; Wiesner et al., 2002). The competence of benzophenones as chemotherapeutic agents, especially as inhibitors of HIV-1 reverse transcriptase RT, cancer and inflammation, is well established and their chemistry has been studied extensively (Revesz et al., 2004, Zeng et al., 2010). The title compound - N-(2-Benzoyl-4-chloro-phenyl)-acetimidic acid ethyl ester (1, Scheme 1) - is an intermediate in the synthesis of certain anxiolytic, anticonvulsant and sedative drugs.
The conformation of N-(2-Benzoyl-4-chloro-phenyl)-acetimidic acid ethyl ester (1, Scheme 1) can be described by the dihedral angles between the approximately planar fragments: two aromatic rings (A and B, cf. Fig. 1), and the N=C—O—C—C chain (C, which is planar within 0.029 (1) Å). All these angles are close to 60°: A/B 69.14 (5) °, A/C 66.71 (8) °, B/C 59.61 (8) °. Interestingly, the C21=O22 double bond is not coplanar with either A or B phenyl rings, the C2—C21(=O22)—C23 plane makes the dihedral angle 52.81 (6) ° with the ring A and 25.51 (8) ° with ring B. Quite similar conformation was observed in the crystal structure of related compound, 2-benzoyl-4-chloroformanilide triacetylhydrazide (Derieg et al., 1970).
In the crystal only some weak but directional C—H···O, C—H···Cl and C—H···π interaction can be found (cf. Table), and they to some extent influence the packing together with van der Waals interactions. Also the phenyl rings B from molecules related by the center of symmetry stack to some extent with the interplanar distance of ca 3.53 Å.