The enzyme arylmalonate decarboxylase () catalyzes the chemical reaction
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-aryl-2-methylmalonate carboxy-lyase (2-arylpropanoate-forming). Other names in common use include AMDASE, 2-aryl-2-methylmalonate carboxy-lyase, and 2-aryl-2-methylmalonate carboxy-lyase (2-arylpropionate-forming).
As of late 2007, only one structure has been solved for this class of enzymes, with the PDB accession code .