Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H12⋯N7i	0.86 (3)	2.12 (2)	2.967 (3)	165 (3)
N2—H13⋯N10ii	0.85 (3)	2.31 (3)	3.154 (4)	172 (2)
N4—H14⋯N8iii	0.80 (2)	2.36 (2)	3.136 (3)	164 (2)
N4—H15⋯N10iv	0.94 (3)	2.50 (3)	3.442 (4)	179 (3)

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