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

Cg is the centroid of the C1–C6 ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.83 (2)	2.09 (2)	2.890 (2)	164 (2)
C3—H3⋯O2ii	0.93	2.56	3.385 (2)	148
C18—H18⋯O3iii	0.93	2.56	3.299 (2)	136
C21—H21B⋯O2iv	0.97	2.59	3.560 (2)	174
C2—H2⋯Cg v	0.93	2.81	3.649 (2)	151

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