Main Reaction: Malate + Malonyl CoA >> tetronic acid

Reference: PubMed ID: 13867384
Authors: BENTLEY R, BHATE DS, KEIL JG
Title: Tetronic acid biosynthesis in molds. I. Formation of carlosic and carolic acids in Penicillium charlesii.
Published: 1962 Mar

Malate + Malonyl CoA --> tetronic acid