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Cycloartane triterpenoids from Guarea macrophylla

Cycloartane triterpenoids from Guarea macrophylla

  1. helikophis
    Nine cycloartane triterpenoids, including two new derivatives 22,25-dihydroxy-cycloart-23E-en-3-one and 24-methylenecy-
    cloartane-3b,22-diol have been isolated from leaves of Guarea macrophylla. The structures were elucidated by interpretation of
    spectral data, mainly 1H and 13C NMR, including bidimensional analysis (HOMOCOSY, HMQC and HMBC).