Table 1. Hydrogen-bond geometry (, ).

Cg is the centroid of the C17C22 ring.

DHA	DH	HA	D A	DHA
O4H4O3i	0.82	2.03	2.757(3)	148
N1H1Cg ii	0.86	2.78	3.527(1)	146

Symmetry codes: (i) ; (ii) .