acetoacetate + fumarate + H(+) => 4-fumarylacetoacetate + H2O
acetoacetate + fumarate + h(+) => 4-fumarylacetoacetate + h2o
acetoacetate + fumarate + H(+) => 4-fumarylacetoacetate + H2O
acetoacetate + fumarate + h(+) => 4-fumarylacetoacetate + h2o