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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1B—H1NB⋯O1A	0.887 (18)	1.977 (18)	2.8638 (13)	176.4 (15)
C3B—H3B⋯O1A	0.95	2.44	3.0436 (14)	121
C4B—H4B⋯O2A	0.95	2.59	3.5134 (15)	165
N1A—H1NA⋯O1Bi	0.847 (18)	1.989 (18)	2.8309 (13)	172.0 (16)
C6A—H6A⋯O2Bi	0.95	2.48	3.3885 (15)	161
C7A—H7A⋯O1Bi	0.95	2.57	3.1611 (14)	121

Symmetry code: (i) .