Main Reaction: cinnamic acid >> p-coumaric acid

Reference: PubMed ID: 18539781
Authors: Deluc L, Bogs J, Walker AR, Ferrier T, Decendit A, Merillon JM, Robinson SP, Barrieu F
Title: The transcription factor VvMYB5b contributes to the regulation of anthocyanin and proanthocyanidin biosynthesis in developing grape berries.
Published: 2008 Aug

cinnamic acid --> p-coumaric acid