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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2N⋯O1i	0.869 (16)	1.955 (17)	2.8169 (10)	170.8 (15)
N3—H3N⋯O3	0.832 (16)	2.216 (15)	2.8899 (10)	138.3 (14)
C2—H2⋯O2ii	0.911 (14)	2.547 (14)	3.3826 (11)	152.8 (12)
C3—H3⋯O4ii	0.971 (15)	2.559 (15)	3.2893 (12)	132.0 (11)

Symmetry codes: (i) ; (ii) .