Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| O3AH3AO3B i | 0.86(4) | 1.93(4) | 2.782(4) | 180(5) |
| O3BH3BO1A ii | 0.83(4) | 1.95(4) | 2.768(3) | 169(4) |
Symmetry codes: (i) 
; (ii) 
.
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