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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1A⋯N2	0.82	2.56	3.1254 (19)	127
O1′—H1B⋯N2′	0.82	2.52	3.0881 (19)	128
C19—H19⋯N3i	0.93	2.54	3.420 (2)	158
C19′—H19′⋯N3′ii	0.93	2.53	3.410 (2)	159

Symmetry codes: (i) ; (ii) .