Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N1H1NO6i	0.86	2.01	2.867(2)	171
N2H2NO4ii	0.86	2.39	3.1331(19)	145
C8H8AO1iii	0.96	2.46	3.325(3)	149
C9H9AO1iv	0.96	2.56	3.491(3)	163

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