Main Reaction: Cinnamic acid >> 4-Coumaric acid

Reference: PubMed ID: 22455871
Authors: Koyama K, Ikeda H, Poudel PR, Goto-Yamamoto N
Title: Light quality affects flavonoid biosynthesis in young berries of Cabernet Sauvignon grape.
Published: 2012 Jun

Cinnamic acid --> 4-Coumaric acid