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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2A—H1N2⋯O1B	0.875 (17)	2.048 (17)	2.9088 (14)	167.7 (17)
N3A—H1N3⋯N1B i	0.858 (18)	2.614 (18)	3.3214 (16)	140.5 (16)
N3A—H2N3⋯O1A ii	0.926 (19)	1.949 (19)	2.8749 (16)	178.7 (15)
N2B—H2N2⋯O1A	0.919 (17)	2.065 (17)	2.9663 (14)	166.6 (16)
N3B—H3N3⋯O1B iii	0.889 (19)	1.980 (19)	2.8682 (16)	175.9 (18)
N3B—H4N3⋯N1A iv	0.858 (17)	2.515 (17)	3.1771 (16)	134.7 (15)
C1A—H1AB⋯O1B v	0.99	2.52	3.3923 (18)	146

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