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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C2B—H2BA⋯O2Bi	0.93	2.54	3.2442 (16)	133
N1A—H1NA⋯O1A	0.904 (18)	1.790 (18)	2.5366 (14)	138.3 (15)
N1B—H1NB⋯O1B	0.91 (2)	1.81 (2)	2.5512 (15)	136.2 (16)
C11B—H11C⋯Cg1ii	0.96	2.68	3.5516 (15)	150
C11B—H11D⋯Cg1iii	0.96	2.60	3.4832 (15)	152
C11A—H11A⋯Cg2iv	0.96	2.61	3.4633 (15)	147
C11A—H11B⋯Cg2v	0.96	2.65	3.5304 (15)	151

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) . Cg1 and Cg2 are the centroids of the C1A–C6A and C1B–C6B rings, respectively.