maleylacetate + sulfite + 2 H(+) => 4-sulfomuconolactone + H2O
maleylacetate + sulfite + 2 h(+) => 4-sulfomuconolactone + h2o
maleylacetate + sulfite + 2 H(+) => 4-sulfomuconolactone + H2O
maleylacetate + sulfite + 2 h(+) => 4-sulfomuconolactone + h2o