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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1NA⋯O1i	0.97 (3)	1.77 (3)	2.738 (3)	179 (2)
N1—H1NB⋯O4	0.86 (3)	2.50 (3)	2.982 (3)	116 (2)
N1—H1NB⋯O2ii	0.86 (3)	2.08 (3)	2.915 (3)	164 (2)
O4—H4A⋯O1	0.82	1.94	2.738 (3)	164
O4—H4A⋯O2ii	0.82	2.58	2.925 (3)	107

Symmetry codes: (i) ; (ii) .