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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1A—H1OA⋯N1A	0.98 (2)	1.77 (2)	2.654 (2)	149 (2)
O1B—H1OB⋯N1B	0.90 (2)	1.86 (2)	2.653 (2)	147 (2)
N2A—H1NA⋯N3B i	0.91 (2)	2.17 (2)	3.065 (2)	166 (2)
N2B—H1NB⋯N3A ii	0.89 (2)	2.25 (2)	3.098 (2)	158 (2)
C7A—H7A⋯O1B iii	0.93	2.55	3.427 (2)	156
C7B—H7B⋯O1A iv	0.93	2.49	3.413 (2)	172

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