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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2A⋯N4i	0.82	2.09	2.811 (2)	147
N3—H3B⋯O1ii	0.92 (3)	2.32 (3)	3.006 (2)	131 (2)
O1—H1⋯N2iii	0.82	2.08	2.805 (2)	147
N1—H1B⋯O2iv	0.87 (3)	2.36 (3)	3.006 (3)	132 (3)

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