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Chemical structures of the seventeen target compounds. 1, 3′-Hydroxydaidein; 2, Butein; 3, Daidzein; 4, Liquiritigenin; 5, Eriodictyol; 6, Butin; 7, Naringenin; 8, Genistein; 9, Tectorigenin; 10, Alpinetin; 11, Isoliquiritigenin; 12, Formononetin; 13, Dalbergin; 14, 3′-O-methylviolanone; 15, Sativanone; 16, Pinocembrin; 17, Prunetin. Analytes numbers in the test is the same as in this figure.
