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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1A⋯O3i	0.86	2.24	3.074 (2)	162
N1—H1A⋯O1ii	0.86	2.47	2.917 (2)	113
N1—H1B⋯O4	0.86	2.05	2.667 (3)	128
N2—H2A⋯O2i	0.86	2.31	3.098 (2)	152
N2—H2B⋯O1	0.86	2.03	2.642 (2)	128
N2—H2B⋯O4iii	0.86	2.33	2.964 (3)	131

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