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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2⋯N1	0.99 (4)	1.70 (4)	2.674 (3)	167 (4)
N2—H2A⋯N3i	0.89 (3)	2.19 (3)	3.076 (4)	176 (2)
N2—H2B⋯O1	0.86 (4)	2.10 (4)	2.946 (4)	171 (3)

Symmetry code: (i) .