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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O3i	0.88 (3)	2.21 (3)	3.001 (2)	150 (2)
N2—H2N⋯O1ii	0.88 (2)	2.11 (2)	2.982 (2)	171.5 (19)
C3—H3⋯O1ii	0.95	2.39	3.269 (2)	154
C3—H3⋯O2ii	0.95	2.48	3.245 (2)	138

Symmetry codes: (i) ; (ii) .