Auto-oxidation of lanost-8-en-3β-yl acetate: ringDderivatives

Abstract
Extensively auto-oxidised lanost-8-en-3β-yl acetate contains, in addition to 1,7,11-trioxolanost-8-en-3β-yl acetate and 1,7,11-trioxolanosta-2,8-diene, significant amounts of 15β-hydroxy-7-oxo-, 15α-hydroxy-7-oxo-, 7,15-dioxo-, and 11,15-dioxo-lanostan-3β-yl acetate.