Main Reaction: Cinnamic acid >> p-coumaric acid

Reference: PubMed ID: 17315067
Authors: Sakakibara N, Nakatsubo T, Suzuki S, Shibata D, Shimada M, Umezawa T
Title: Metabolic analysis of the cinnamate/monolignol pathway in Carthamus tinctorius seeds by a stable-isotope-dilution method.
Published: 2007 Mar 7

Cinnamic acid --> p-coumaric acid