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