Main Reaction: Cinnamic acid >> 4-Coumaric acid

Reference: PubMed ID: 24128475
Authors: Kavalier AR, Ma C, Figueroa M, Kincaid D, Matthews PD, Kennelly EJ
Title: Targeted analysis of polyphenol metabolism during development of hop (Humulus lupulus L.) cones following treatment with prohexadione-calcium.
Published: 2014 Feb 15

Cinnamic acid --> 4-Coumaric acid