Constituents of Rosaceous Plants. I. Structures of New Triterpenoids from Cowania mexicana.
作者:Takao KONOSHIMA、Midori TAKASAKI、Mutsuo KOZUKA、Mitsumasa HARUNA、Kazuo ITO、James R. ESTES、Kuo-Hsiung LEE
DOI:10.1248/cpb.41.1612
日期:——
In our search for possible anti-tumor-promoters, we carried out an investigation of the leaves and branches of Cowania mexicana D. DON (Rosaceae). Two new cucurbitane type triterpenes, 15-oxo-cucurbitacin F (3) and 15-oxo-23,24-dihydrocucurbitacin F (4), were isolated together with cucurbitacin F (1) and 23,24-dihydrocucurbitacin F (2). These triterpenes were inhibitorss of Epstein-Barr virus early