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The chemical structures of liquiritin (1); naringin (2); hesperidin (3); peimine (4); peiminine (5); liquiritigenin (6); glycyrrhizic acid (7); bergapten (8); nobiletin (9); osthole (10); glycyrrhetinic acid (11); diphenhydramine (IS for positive ionization mode) (12); and chloromycetin (IS for negative ionization mode) (13).
