The root and aerial parts of Rosa taiwanensis Nakai contain the chemical constituents phenols, unsaturated acids, loliolide, abscisic acid, flavones, sterols, lupeol, betulin, betulinic acid, oleanolic acid and ursolic acid derivatives. Among them, 2α,3α‐dihydroxyurs‐12,19‐dien‐28‐oic acid and its C‐3 epimer are new compounds.
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Yang et al. (1995) studied this question.
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