Research Article

Revising Reverse-Phase Chromatographic Behavior for Efficient Differentiation of Both Positional and Geometrical Isomers of Dicaffeoylquinic Acids

Scheme 1

Chemical structures of the trans-form positional isomers of dicaffeoylquinic acids (diCQAs), namely, 1,3-diCQA, 1,5-diCQA, 3,4-diCQA, 3,5-diCQA, and 4,5-diCQA.