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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O2	0.88	1.95	2.828 (4)	172
N2′—H2′⋯O2	0.88	2.02	2.895 (5)	173