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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O2i	0.86 (1)	2.22 (1)	3.058 (2)	163 (2)
O2—H2⋯N1ii	0.86 (1)	1.89 (1)	2.741 (2)	172 (2)

Symmetry codes: (i) ; (ii) .