Chemical evaluation reveals new triterpenes and other compounds in Betula ovalifolia bark and leaves, indicating potential benefits.
Two new seco-dammarane-type triterpenes, called ovalifoliolides A and B, were isolated from the methanol extract of fresh leaves of Betula ovalifolia together with 12-O-acetylbetulafolienetriol, (3R)-3, 5'-dihydroxy-4'-methoxy-3', 4"-oxo-1, 7-diphenyl-1-heptene and rutin. Betulin, betulin 3-caffeate, rhododendrin, (+)-catechin, (+)-catechin 7-O-β-D-xylopyranoside and procyanidin B-3 were also isolated from the bark. Their structures were determined by spectral data and chemical evidence.
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Fuchino et al. (1998) studied this question.
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