De-A-oleanane

As seen in Fig. 5.19, contributions from woody an-giosperms are likely to lead to the presence of oleanane in ancient sediments and oils, often accompanied by its ring-A degraded counterpart, 10P-de-A-oleanane.The ring-A degradation products of lupeol (10P-de-A-lupane) and OC-amyrin (10P-de-A-ursane) may also be present (Fig. 5.29 Woolhouse et al. 1992). 

---