This work was financially supported by grants from the National Basic Research Program of China(973 Program,2009CB522300 and 2009CB940900);National Natural Science Funding of China(31170332);the Young Academic and Technical Leader Raising Foundation of Yunnan Province(2010CI047).
Two new tirucallane triterpenoids,2a-ethoxy-2,3-secotirucalla-2,29-epoxy-7-ene-23-oxo-3-oic acid(1)and(23E)-2a-hydroxytirucalla-7,23,25-triene-3-one(2),along with the known 2,3-secotirucalla-2,3;2,29-diepoxy-7-ene-3,2...