Scheme for the Synthesis of 13C6-Caffeyl and 13C6-Coniferyl Alcohols.
(A) Scheme for the synthesis of 13C6-caffeyl alcohol.
(B) to (D) LC-MS/MS analysis of 13C6-caffeic acid (B), 13C6-caffeic acid methyl ester (C) and 13C6-caffeyl alcohol (D).
(E) Scheme for the synthesis of 13C6-coniferyl alcohol.
(F) and (G) LC-MS/MS analysis of 13C6-ferulic acid ethyl ester (F) and 13C6-coniferyl alcohol (G).