Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N2H2BO1i	0.87(2)	1.89(2)	2.730(3)	164(2)
N2H2CO2	0.86(2)	1.83(2)	2.680(3)	169(2)
C10H10BO1ii	0.97	2.46	3.297(4)	145

Symmetry codes: (i) ; (ii) .