Figure 1From: The nature and fate of natural resins in the geosphere Part XI.† Ruthenium tetroxide oxidation of a mature Class Ib amber polymer‡(A) Labdanoid carbon skeleton (accepted numbering convention indicated). (B) Regular configuration labdanoid diterpene. R = CO2H, communic acid; R = CH2OH, communol; R = CH3, biformene. (C) Enantio configuration labdanoid diterpene. R = CO2H, ozic acid; R = CH2OH, ozol; R = CH3, enantio biformene.Back to article page