Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C11H11O2i | 0.93 | 2.60 | 3.309(3) | 134 |
| C7H7AO1ii | 0.97 | 2.66 | 3.586(5) | 160 |
Symmetry codes: (i) 
; (ii) 
.
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