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

Cg is the centroid of the N1,C1–C5 pyridine ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1i	0.93 (3)	1.98 (3)	2.9110 (18)	174 (2)
C21—H21A⋯Cgii	0.93	2.97	3.7358 (19)	140

Symmetry codes: (i) ; (ii) .