Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C1H1AO4i | 0.97 | 2.56 | 3.485(6) | 160 |
| C21H21BO2ii | 0.97 | 2.65 | 3.377(7) | 133 |
Symmetry codes: (i) 
; (ii) 
.
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