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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H1⋯O2i	0.95 (3)	2.09 (4)	3.012 (3)	163 (3)
N4—H2⋯O2ii	0.85 (5)	2.11 (5)	2.933 (3)	162 (4)

Symmetry codes: (i) ; (ii) .