Seven compounds were isolated from the root of P. viscosa J. Don, family Rosaceae. By means of [1H]NMR, [13C]NMR and mass spectral anal. and chem. studies, their chem. structures were elucidate to be (+)-catechin, (+)-catechin-3-O-b-D-glucoside (I), afzelechin(4a-8)-catechin, procyanidin B-3, procyanidin B-3 3'-O-b-D-glucopyranoside, procyanidin C-2, and potentillanin. I exhibited a protective effect against hepatitis symptoms in test animals.

Key words: CHEMICAL COMPOSITION, MOLECULAR STRUCTURE, C13 NMR SPECTROMETRY, PYRANOSE, GLUCOSE, PROTON MAGNETIC RESONANCE SPECTROMETRY, GLYCOSIDE, ROSACEAE, CHEMICAL DEGRADATION, TANNIN