Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2N⋯O3	0.871 (9)	1.817 (9)	2.6848 (14)	174.0 (17)
N3—H3N⋯O1i	0.858 (9)	2.158 (10)	3.0079 (14)	170.6 (17)
O3—H3AO⋯N4ii	0.839 (9)	1.968 (10)	2.8046 (16)	175 (2)
O3—H3BO⋯O2iii	0.839 (9)	1.991 (10)	2.8295 (15)	179 (2)

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