Main Reaction: cinnamic acid + malonic acid >> bisdesmethoxycurcumin

Reference: PubMed ID: 18603793
Authors: Kita T, Imai S, Sawada H, Kumagai H, Seto H
Title: The biosynthetic pathway of curcuminoid in turmeric (Curcuma longa) as revealed by 13C-labeled precursors.
Published: 2008 Jul

cinnamic acid + malonic acid --> bisdesmethoxycurcumin