The enzyme o-pyrocatechuate decarboxylase (EC 4.1.1.46) catalyzes the chemical reaction

2,3-dihydroxybenzoate catechol + CO₂

This enzyme belongs to the family of lyases, specifically the carboxy-lyases, which cleave carbon-carbon bonds. The systematic name of this enzyme class is 2,3-dihydroxybenzoate carboxy-lyase (catechol-forming). This enzyme is also called 2,3-dihydroxybenzoate carboxy-lyase. This enzyme participates in benzoate degradation via hydroxylation and carbazole degradation.

• Rao PV, Moore K, Towers GH (1967). "O-pyrocatechiuc acid carboxy-lyase from Aspergillus niger". Arch. Biochem. Biophys. 122 (2): 466–73. doi:10.1016/0003-9861(67)90220-2. PMID 6066253.