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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O4i	0.86	2.09	2.946 (3)	171
N2—H2N⋯O2ii	0.86	2.32	3.094 (3)	151

Symmetry codes: (i) ; (ii) .