this enzyme belongs to the family of hydrolases, specifically those acting on carbon-carbon bonds in ketonic substances. the systematic name of this enzyme class is 2-hydroxymuconate-semialdehyde formylhydrolase. other names in common use include 2-hydroxy-6-oxohepta-2,4-dienoate hydrolase, 2-hydroxymuconic semialdehyde hydrolase, hmsh, and hod hydrolase. this enzyme participates in 5 metabolic pathways: benzoate degradation via hydroxylation, toluene and xylene degradation, 1,4-dichlorobenzene degradation, carbazole degradation, and styrene degradation.