Fig. 3

TIC (top) and extracted ion chromatograms (EICs) for the species identified in the chilca dye by HPLC–MS/MS. The different EICs correspond to the extraction of the ions corresponding to the [M−H]⁻ of the empirical formulas listed on the right, and in particular: C₂₅H₂₄O₁₂, corresponding to different isomers of di-O-caffeoylquinic acid; C₂₆H₂₆O₁₂, corresponding to different isomers of O-caffeoyl-feruloylquinic acid; C₁₅H₁₀O₇, corresponding to quercetin; C₁₅H₁₀O₆, corresponding to luteolin, C₁₇H₁₄O₈, corresponding to dimethyl-quercetin (possibly quercetagetin dimethyl ether); C₁₆H₁₂O₇, corresponding to tetrahydroxymethoxyflavone/3-methylquercetin; C₁₆H₁₂O₆, corresponding to luteolin methyl ether/trihydroxymethoxyflavone/(iso)kaempferide