Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N3H03N5i	0.861(16)	2.125(16)	2.9386(13)	157.3(14)
C6H6CO1ii	0.98	2.30	3.2233(13)	156
C16H16O1iii	0.95	2.42	3.2318(13)	143
C13H13N5iv	0.95	2.57	3.3189(15)	136

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