3-(cis-5,6-dihydroxycyclohexa-1,3-dien-1-yl)propanoate + NAD(+) <=> 3-(2,3-dihydroxyphenyl)propanoate + NADH + H(+)
3-(cis-5,6-dihydroxycyclohexa-1,3-dien-1-yl)propanoate + nad(+) <=> 3-(2,3-dihydroxyphenyl)propanoate + nadh + h(+)