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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯S1i	0.84 (1)	2.34 (1)	3.175 (2)	170 (3)
N3—H31⋯S1ii	0.85 (1)	2.50 (1)	3.337 (2)	167 (2)
N4—H41⋯O2iii	0.85 (1)	2.14 (1)	2.987 (2)	172 (3)
N4—H42⋯O3iv	0.85 (1)	2.31 (2)	3.044 (2)	144 (2)

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