Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
C5H5O4i	0.98	2.63	3.407(3)	136
C8H8O3ii	0.98	2.64	3.308(4)	126
O1H1O4i	0.82	1.91	2.718(3)	169
O4H4WAO3ii	0.83	2.05	2.850(3)	162
O4H4WBO1iii	0.86	1.94	2.764(3)	159

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