A new antibacterial polyphenol, copalliferol A, has been isolated from four dipterocarp species, Hopea cordifolia, Hopea brevipetiolaris(=Balanocarpus zeylanicus), Shorea stipularis and Vateria copallifera. The latter two species also contained another polyphenol, stemonoporol, which when treated with formic or toluene-para-sulphonic acid is transformed into copalliferol A.
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Sotheeswaran et al. (1983) studied this question.
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