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Typical mass spectra of the fragmentation patterns of 3-coumaroyl-4-caffeoylquinic acid (A), 3-caffeoyl-4-coumaroylquinic acid (B), 3-coumaroyl-5-caffeoylquinic acid (C), 3-caffeoyl-5-coumaroylquinic acid (D), 4-coumaroyl-5-caffeoylquinic acid (E) and 4-caffeoyl-5-coumaroylquinic acid (F).
