Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N1H1O1i	0.86	2.23	2.941(3)	140
N2H2AO1i	0.86(1)	2.24(2)	2.985(3)	145(3)
N2H2BO1ii	0.86(1)	2.12(1)	2.977(3)	173(4)

Symmetry codes: (i) ; (ii) .