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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1A⋯O2i	0.86	2.02	2.877 (4)	174
N2—H2A⋯O1ii	0.86	2.16	2.901 (4)	144
C18—H18A⋯O2iii	0.93	2.54	3.368 (5)	148
C20—H20A⋯Cl2	0.93	2.82	3.633 (4)	146

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