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Extraction ion chromatograms of samples with IS of (1) 3,4-dihydroxybenzoic acid, (2) 5-O-caffeoylquinic acid, (3) 3-O-caffeoylquinic acid, (4) caffeic acid, (5) 4-O-caffeoylquinic acid, (6) IS (chloramphenicol), (7) 3,5-O-di-caffeoylquinic acid, (8) luteoloside, (9) rutin, (10) 3,4-O-di-caffeoylquinic acid, and (11) 4,5-O-di-caffeoylquinic acid.
