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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O3i	0.80 (2)	2.18 (2)	2.964 (2)	164 (2)
O4—H1O⋯O2ii	0.88 (3)	1.90 (3)	2.772 (2)	174 (2)

Symmetry codes: (i) ; (ii) .