Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
O5H5AO4i	0.87	1.76	2.618(9)	170
O5H5BO3ii	0.87	1.83	2.602(9)	146
N1H1O3	0.88	2.32	3.010(11)	136
N1H1O4	0.88	2.31	2.974(10)	132
N2H2Cl2iii	0.88	2.70	3.354(8)	132
N2H2Cl1iv	0.88	2.84	3.435(10)	126

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