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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1i	0.82	1.85	2.6639 (12)	172
N2—H71⋯O1ii	0.870 (17)	2.276 (17)	3.0184 (13)	143.2 (12)
N2—H72⋯N2iii	0.895 (18)	2.358 (17)	3.1249 (15)	143.8 (15)

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