Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
O6H6AO5	0.82	1.68	2.4296(19)	151
N2H2AO5	0.86	2.12	2.7852(18)	134
N1H1AO4i	0.89	1.77	2.661(2)	177
N1H1BN3i	0.89	2.24	3.041(2)	150
N1H1CO6ii	0.89	2.21	3.064(2)	160
C5H5O6ii	0.93	2.60	3.293(2)	132
C6H6O8iii	0.93	2.60	3.176(2)	121

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