Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N1AH1AS1A i | 1.00 | 2.73 | 3.5154(17) | 136 |
| N2BH2BS1B ii | 1.00 | 2.66 | 3.4556(17) | 137 |
Symmetry codes: (i) 
; (ii) 
.
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