Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N1H1NO1i	0.93(3)	2.00(3)	2.859(2)	154(2)
C5H5O5ii	0.95	2.57	3.427(3)	150
C10H10O1iii	0.95	2.46	3.271(3)	144

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