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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H11⋯O2i	0.89 (1)	1.98 (1)	2.869 (2)	172 (2)
N2—H12⋯O1ii	0.89 (1)	2.19 (1)	3.038 (2)	158 (2)

Symmetry codes: (i) ; (ii) .