Main Reaction: phenylalanine >> 4-coumaroul-CoA

Reference: PubMed ID: 28531145
Authors: Jonker A, Yu P
Title: The Occurrence, Biosynthesis, and Molecular Structure of Proanthocyanidins and Their Effects on Legume Forage Protein Precipitation, Digestion and Absorption in the Ruminant Digestive Tract.
Published: 2017 May 22

phenylalanine --> 4-coumaroul-CoA