Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N1H1AS1i | 0.91 | 2.46 | 3.3539(13) | 167 |
| N2H2AS1ii | 0.91 | 2.58 | 3.4327(14) | 157 |
Symmetry codes: (i) 
; (ii) 
.
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