Table 2. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N1H1AO2iii	0.90	2.16	2.983(11)	152
N1H1BO4iv	0.90	2.27	3.103(11)	154
N2H2AO1v	0.90	2.21	2.975(10)	142
N2H2BO2vi	0.90	2.19	2.971(11)	145
O4H4O1v	0.83(2)	2.23(3)	2.853(8)	132(4)
O4H4O2v	0.83(2)	2.44(7)	3.175(9)	148(11)

Symmetry codes: (iii) ; (iv) ; (v) ; (vi) .