Main Reaction: vanillic acid >> protocatechuic acid

Reference: PubMed ID: 27634497
Authors: Varman AM, He L, Follenfant R, Wu W, Wemmer S, Wrobel SA, Tang YJ, Singh S
Title: Decoding how a soil bacterium extracts building blocks and metabolic energy from ligninolysis provides road map for lignin valorization.
Published: 2016 Oct 4

vanillic acid --> protocatechuic acid