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Four hexacyclic oleananes having characteristic mass spectra with an intense fragment at m/z 325 were found in Late Cretaceous/Tertiary terrigenous oils and immature source rocks containing 18α-oleanane and other saturated pentacyclic compounds of higher plant origin. They are sometimes as abundant as 18α-oleanane itself. They were not found in oils without oleanane. The major hexacyclic oleanane,...
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