“…Not only are they tetracyclic with one double bond that can be hydro genated by catalytic reduction, but this double bond is present in an isopropylidene group since ozonolysis of lanosterol or cryptosterol gives acetone (22,67). Moreover, the principal product of dehydro genation with selenium is 1,2,8-trimethylphenanthrene (116,67) as is the case with a-e1emolic acid (109), and analogous compounds are obtained by chromic anhydride oxidation of dihydro-a-elemolic acid and dihydrocryptosterol (109, 11S). Attempts, however, to relate the NOLLER two groups of compounds more closely by comparing hydrocarbons derived from them have not been successful (67).…”