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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H2N⋯O4	0.925 (18)	1.749 (19)	2.674 (3)	178.3 (17)
N1—H2N⋯O3i	0.925 (18)	2.042 (18)	2.926 (3)	159.4 (16)
N1—H1N⋯O3ii	0.92 (3)	1.96 (2)	2.825 (3)	156 (1)
N1—H1N⋯O3iii	0.92 (3)	1.96 (2)	2.825 (3)	156 (1)

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