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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O6i	0.89 (2)	2.39 (3)	3.068 (2)	134 (3)
N1—H1N⋯O7ii	0.89 (2)	2.44 (2)	3.180 (2)	141 (3)
N3—H3N⋯O2iii	0.88 (2)	1.93 (2)	2.810 (2)	172 (2)
O7—H7O⋯O1S	0.87 (2)	1.87 (2)	2.732 (2)	171 (3)
O8—H8O⋯O4iv	0.83 (2)	1.95 (2)	2.751 (2)	162 (3)

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