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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1	0.86	1.94	2.643 (5)	138
C18—H18⋯Cgi	0.93	2.84	3.627 (1)	142

Symmetry code: (i) . Cg is the centroid of the C16–C21 ring.