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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O2i	0.86	2.09	2.930 (4)	166
N6—H6⋯O1ii	0.86	2.04	2.884 (4)	165
C3—H3⋯O1iii	0.93	2.56	3.328 (4)	140

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