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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N—H2N⋯O3i	0.95 (3)	2.13 (3)	2.960 (2)	145.6 (19)
N—H1N⋯O4ii	0.89 (2)	2.25 (2)	3.045 (2)	147.3 (19)

Symmetry codes: (i) ; (ii) .