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HPLC chromatographic profiles (275 nm) of Brazilian red propolis (A) in comparison with the resins of Dalbergia ecastaphyllum (B) and Symphonia globulifera (C). Numbers correspond to liquiritigenin (1), isoliquiritigenin (2), formononetin (3), vestitol (4), neovestitol (5), medicarpin (6), 7-O-neovestitol (7), guttiferone E (8), and oblongifolin B (9). UV spectra of compounds 1–9 are displayed at the bottom of the figure.
