Table 1. Hydrogen-bond geometry (, ).
Cg is the centroid of the C2/C3/C4/C5/S1 ring.
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C9H9AO2i | 0.99 | 2.45 | 3.270(3) | 139 |
| C11H11O1ii | 0.95 | 2.47 | 3.312(4) | 147 |
| C7H7C Cg iii | 0.98 | 2.86 | 3.693(2) | 143 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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