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

Cg1 and Cg2 are the centroids of the N1B–N3B/C2B/C3B C2A–C7A rings, respectively.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C1B—H1BA⋯N3A i	0.97	2.59	3.409 (4)	142
C4A—H4A⋯N3B ii	0.93	2.66	3.443 (4)	143
C7A—H7A⋯Cg1iii	0.93	2.69	3.423 (3)	136
C4B—H4B⋯Cg2iv	0.93	2.89	3.481 (3)	132

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