SEARCH Articles Figures Tables A-Amyrin (ursane from Balanophora elongata Germanicanes, Taraxastanes, Oleananes, and Ursanes Seco-ursane glycoside Taraxastanes and Ursanes Typical Biotransformations in the Ursane Family Ursane Ursane Group Ursane Triterpenoid Ursane triterpene Ursanes Ursolic acid