Condensed Tannins from the bark of Guazuma ulmifolia Lam. (Sterculiaceae)

from the bark of guazuma ulmifolia lam. (sterculiaceae), nine compounds were isolated and identified: ent-catechin, epicatechin, ent-gallocatechin, epigallocatechin, epiafzelechin-(4β→8)-epicatechin, epicatechin-(4β→8)-catechin (procyanidin b1), epicatechin-(4β→8)-epicatechin (procyanidin b2), epicatechin-(4β→8)-epigallocatechin, and the new compound 4'-o-methyl-epiafzelechin. their structures were elucidated on the basis of spectral and literature data. hplc fingerprint analysis of the semipurified extract was performed on a c18 column, with a mixture of acetonitrile (0.05% trifluoroacetic acid):water (0.05% trifluoroacetic acid) (v/v) with a flow rate of 0.8 ml min-1. the sample injection volume was 100 μl and the wavelength was 210 nm.