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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1i	0.89 (3)	1.99 (3)	2.841 (4)	160 (6)
O2—H2⋯N2	0.82	1.86	2.580 (4)	145

Symmetry code: (i) .