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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2A—H2AA⋯O1B	0.86	2.25	3.082 (4)	164
N2B—H2BA⋯O1A	0.86	2.26	3.091 (5)	163
N1A—H1AA⋯O2Bi	0.86	2.28	3.040 (4)	147
N1B—H1BA⋯O2Aii	0.86	2.33	3.077 (4)	145

Symmetry codes: (i) ; (ii) .