Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C14H14AO4 | 0.93 | 2.30 | 2.9073(18) | 123 |
| C9H9AO3i | 0.96 | 2.53 | 3.397(2) | 150 |
| C20H20AO1ii | 0.97 | 2.51 | 3.304(5) | 139 |
Symmetry codes: (i) 
; (ii) 
.
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