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

Cg1 is the centroid of the C1–C6 ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯N16i	0.86	2.48	3.240 (3)	147
N4—H4B⋯O9ii	0.86	2.35	3.196 (2)	170
N8—H8⋯N4iii	0.86	2.31	3.085 (2)	150
N11—H11⋯O9iv	0.86	2.27	3.015 (2)	145
C6—H6⋯Cg1iii	0.93	2.94	3.836 (3)	162

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