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

Cg1 is the centroid of the N1–N3/C17/C18 ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C16—H16A⋯Cg1i	0.93	2.78	3.571	144
C21—H21A⋯O3ii	0.93	2.47	3.202 (4)	136

Symmetry codes: (i) ; (ii) .