Involved in the gamma-resorcylate (2,6-dihydroxybenzoate) catabolism (PubMed:17158677). Catalyzes the reduction of maleylacetate to 3-oxoadipate (PubMed:17158677, PubMed:27040018). 3-oxoadipate + NAD(+) = H(+) + maleylacetate + NADH Aromatic compound metabolism. Homodimer. Induced in the presence of gamma-resorcylate. Each subunit consists of two domains: an N-terminal NADH-binding domain adopting an alpha/beta structure and a C-terminal functional domain adopting an alpha-helical structure. Belongs to the iron-containing alcohol dehydrogenase family.