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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H2⋯Oi	0.88	2.02	2.8970 (12)	175
N1—H1⋯N4ii	0.88	2.16	3.0017 (14)	161

Symmetry codes: (i) ; (ii) .