Two new tetranortriterpenoids from the bark of Soymida febrifuga A. Juss (Meliaceae) have been assigned structures (3) and (5). Both compounds have a β-substituted γ-methoxybutenolide in place of the usual β-substituted furan system.
K. K. Purushothaman, S. Chandrasekharan, J. D. Connolly and D. S. Rycroft, J. Chem. Soc., Perkin Trans. 1, 1977, 1873 DOI: 10.1039/P19770001873
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