Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N1—H1A⋯N4 | 0.90 (2) | 1.99 (3) | 2.676 (3) | 131 (3) |
| N1—H1B⋯S1i | 0.87 (2) | 2.58 (2) | 3.399 (2) | 159 (4) |
| N2—H2A⋯S1ii | 0.85 (2) | 2.53 (2) | 3.338 (2) | 160 (4) |
Symmetry codes: (i) 
; (ii) 
.
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