• Applied Biological Chemistry
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• v.48 no.4
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• pp.421-424
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• 2005

The leaf of Petasites japonicus was extracted with 80% aqueous MeOH and solvent fractionated with EtOAc, n-BuOH and water successively. From the EtOAc fractions, two triterpenoids were isolated through the repeated silica gel and ODS column chromatographies. The chemical structures of the isolated terpenoids were determined as rosamutin (1) and peduncloside (2) through the interpretation of several spectral data including 2D-NMR such as $^1H-{^1H}$ gCOSY, gHSQC and gHMBC.