Das cascas de Guazuma ulmifolia Lam. (Sterculiaceae) foram isolados e identificados nove compostos: ent-catequina, epicatequina, ent-galocatequina, epigalocatequina, epiafzelequina-(4β→8)-epicatequina, epicatequina-(4β→8)-catequina (procianidina B1), epicatequina-(4β→8)-epicatequina (procianidina B2), epicatequina-(4β→8)-epigalocatequina, e a nova substância 4'-O-metil-epiafzelequina. Suas estruturas foram elucidadas com base nos dados espectrais e da literatura. A "impressão digital" de um extrato semipurificado por cromatografia líquida de alta eficiência foi realizada em coluna C18, com uma mistura de acetonitrila (0,05% de ácido trifluoroacético):água (0,05% de ácido trifluoroacético) (v/v) com vazão de 0,8 mL min-1. O volume injetado da amostra foi de 100 µL e o comprimento de onda 210 nm.

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.