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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2O⋯O4i	0.88 (3)	1.79 (3)	2.672 (4)	177 (5)
N1—H1N⋯O3ii	0.84 (3)	2.11 (3)	2.941 (4)	168 (4)
O4—H41⋯O1iii	0.82 (3)	2.11 (4)	2.894 (4)	162 (5)
O4—H42⋯O1iv	0.84 (3)	2.09 (3)	2.881 (4)	156 (5)

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) .