Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N2AH2A1S1i	0.89	2.45	3.324(17)	167
N2AH2A2O2B ii	0.89	2.41	3.187(19)	146
N3AH3A1O1B iii	0.89	2.58	3.282(16)	136
N2BH2B1S1i	0.89	2.77	3.459(17)	135
N3BH3B1O2C iii	0.89	2.45	3.22(2)	145
N3BH3B2S1iv	0.89	2.38	3.255(18)	166

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