Table 4. Experimental details.

Crystal data
Chemical formula	C6H6N2O·C5H4ClNO
M r	251.67
Crystal system, space group	Monoclinic, P21/n
Temperature (K)	173
a, b, c (Å)	8.0095 (3), 6.6434 (2), 20.6585 (6)
β (°)	92.563 (1)
V (Å3)	1098.15 (6)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.34
Crystal size (mm)	0.20 × 0.15 × 0.09
Data collection
Diffractometer	Bruker APEXII CCD
No. of measured, independent and observed [I > 2σ(I)] reflections	19834, 2745, 2461
R int	0.041
(sin θ/λ)max (Å−1)	0.671
Refinement
R[F2 > 2σ(F2)], wR(F2), S	0.032, 0.091, 1.06
No. of reflections	2745
No. of parameters	155
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.33, −0.23

Computer programs: SAINT (Bruker, 2021 ▸), APEX4 (Bruker, 2021 ▸), SHELXT2018 (Sheldrick, 2015a ▸), SHELXL2018 (Sheldrick, 2015b ▸) and OLEX2 (Dolomanov et al., 2009 ▸).