Table 1. Hydrogen-bond geometry (Å, °).

Cg1 is the centroid of the imidazole ring N1/N2/C1/C2/C7.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C3—H3A⋯N3i	0.95	2.65	3.459 (7)	144
C8—H8A⋯Cl2ii	0.98	2.71	3.643 (6)	160
C8—H8B⋯Cl1iii	0.98	2.82	3.719 (6)	152
C21—H21B⋯Cl1ii	0.95	2.77	3.616 (3)	149
C16—H16B⋯Cg1ii	0.98	2.91	3.671 (8)	135

Symmetry codes: (i) ; (ii) ; (iii) .