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

Cg2 is the centroid of the C3–C8 phenyl ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H2N4⋯N1i	0.871 (16)	2.208 (16)	3.0709 (18)	171.1 (15)
C1—H1A⋯N2ii	0.93	2.50	3.4035 (16)	166
N4—H1N4⋯Cg2iii	0.87 (2)	2.58 (2)	3.3929 (16)	156.0 (17)

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