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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1i	0.84 (1)	2.03 (2)	2.833 (3)	162 (4)
N2—H2⋯O1ii	0.88 (1)	2.13 (2)	2.974 (3)	161 (3)

Symmetry codes: (i) ; (ii) .