(3R,5S,7R,8R,9S,10S,12S,13R,14S)-10,13-Di-methyl-17-[5-oxo-5-(prop-2-yn-1-yl--oxy)pentan-2-yl]hexa-deca-hydro-1H-cyclo-penta[a]phenanthrene-3,7,12-triyl tri-acetate

摘要

In the title compound, C33H48O8, four terminal H atoms of cholic acid are replaced by three acetyl and one terminal alkyne group. All the acetyl residues are twisted with respect to the rings (A, B and C) to which they are attached. The cyclopentane ring D adopts an envelope conformation with the methylsubstituted C atom as the flap. Rings A, B and C have chair conformations. The dihedral angle between the mean planes of rings C and D is 4.70 (11). In the crystal, molecules are linked by C—HO hydrogen bonds, forming a threedimensional structure.