(2E)-3-(2,3-dihydroxyphenyl)prop-2-enoate + O2 <=> (2Z,4E,7E)-2-hydroxy-6-oxonona-2,4,7-trienedioate + H(+)
(2e)-3-(2,3-dihydroxyphenyl)prop-2-enoate + o2 <=> (2z,4e,7e)-2-hydroxy-6-oxonona-2,4,7-trienedioate + h(+)