(3E,5R)-5-carboxy-2-oxohept-3-enedioate + H(+) <=> (2Z,4Z)-2-hydroxyhepta-2,4-diene-1,7-dioate + CO2
(3e,5r)-5-carboxy-2-oxohept-3-enedioate + h(+) <=> (2z,4z)-2-hydroxyhepta-2,4-diene-1,7-dioate + co2
(3E,5R)-5-carboxy-2-oxohept-3-enedioate + H(+) <=> (2Z,4Z)-2-hydroxyhepta-2,4-diene-1,7-dioate + CO2
(3e,5r)-5-carboxy-2-oxohept-3-enedioate + h(+) <=> (2z,4z)-2-hydroxyhepta-2,4-diene-1,7-dioate + co2