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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N21—H21⋯N24	0.88	2.50	3.033 (2)	119
N21—H21⋯N24i	0.88	2.22	2.804 (2)	123

Symmetry code: (i) .