Table 1. Hydrogen-bond geometry (, ).

Cg4 is the centroid of the C9C14 ring.

DHA	DH	HA	D A	DHA
C13H13O2i	0.93	2.35	3.245(2)	163
C15H15O3ii	0.93	2.56	3.485(2)	172
C17H17AO1ii	0.96	2.42	3.269(2)	147
C3AH3A2Cg4iii	0.97	2.96	3.914(3)	169

Symmetry codes: (i) ; (ii) ; (iii) .