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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3O⋯O2	1.00 (4)	1.79 (4)	2.780 (3)	172 (4)
N4—H1N⋯O2	0.96 (3)	2.45 (2)	2.828 (3)	103 (2)