“…41 Dicaffeoylquinic acids have been extensively reported in Table 2 Retention time (Rt), wavelengths of maximum absorption in the visible region (λ max ), mass spectral data, identification and quantification of phenolic compounds in hydromethanolic extract and infusion of milk thistle (mean ± SD) a hydroalcoholic extracts obtained from different parts of artichoke, as mentioned above. 13,15,16,[31][32][33][34][35][36][38][39][40] Four signals in artichoke (compounds 4, 9, 11 and 13) showed a pseudomolecular ion ([M − H] − ) at m/z 337 (Tables 1 and 2). These compounds were assigned as the 3-acyl, 4-acyl and 5-acyl isomers of p-coumaroylquinic acid based on their HPLC retention and MS 2 fragmentation characteristics, as previously reported by Clifford et al 29,42 Thus, compound 4 (artichoke) was tentatively identified as 3-p-coumaroylquinic acid, yielding the base peak at m/z 163 ([coumaric acid-H] − ).…”