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An unusual 2,3-secotaraxerene and other cytotoxic triterpenoids from pleiocarpa pycnantha (apocynaceae) leaves collected from Nigeria
(MDPI, 2014)
Three known triterpenoids, namely ursolic acid (1), and the 27-E- and 27-Z-pcoumaric
esters of ursolic acid (compounds 2, 3), were isolated together with a new
triterpene 2,3-seco-taraxer-14-en-2,3-lactone [pycanocarpine ...