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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2B⋯N1i	0.82	2.00	2.817 (2)	173
N2—H2A⋯O1ii	0.83 (2)	2.29 (2)	3.107 (2)	166

Symmetry codes: (i) ; (ii) .