“…The dehydration of these alcoholls with HCI in CHCI3 leads to dienes XCIX and C, while oxidation of diene XCIX yields to epoxides CI and CII and enone CIII (Scheme 8) [76]. It was believed that the double bond in GTA does not enter into reaction with ozone [78,79] because of the wellknown inertness of this bond (caused by spatial hindrances) in triterpcnoids of the l~-amyrin series.…”