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Stigmasterol, oleanolic acid, morolic acid, hederagenin, and 11α-hydroperoxy-hederagenin were isolated and characterized as the sapogenins present in the aerial parts of the medicinal plant Serjania triquetra (Sapindaceae). The structure of the novel triterpenoid derivative, 11α-hydroperoxy-diacetyl hederagenin, considered as a key biogenetic and chemical intermediate, was confirmed by relay synthesis...