The title compound, C25H31NO2.H2O, has the outer two six-membered rings in
chair conformations, while the central ring is in an 8 beta ,9 alpha -half-
chair conformation. The five-membered ring adopts a 13,14-half-chair confor
mation. The pyridyl-methylene moiety has an E configuration with respect to
the carbonyl group at position 17. The structure is stabilized by intermol
ecular O-H . . .N and O-H . . .O hydrogen bonds.