1,6-Dihydroxycyclohexa-2,4-Diene-1-Carboxylate Dehydrogenase Activity
Cis-1,2-Dihydroxycyclohexa-3,5-Diene-1-Carboxylate:NAD+ Oxidoreductase Activity
Catalysis of the reaction: NAD+ + 1,6-dihydroxycyclohexa-2,4-diene-1-carboxylate = NADH + CO2 + catechol.