preferred_name: 4-oxohex-2-enedioate + H(+) => 2-(5-oxo-2,5-dihydrofuran-2-ylidene)acetate + H2O
preferred_name_lc: 4-oxohex-2-enedioate + h(+) => 2-(5-oxo-2,5-dihydrofuran-2-ylidene)acetate + h2o
label: 4-oxohex-2-enedioate + H(+) => 2-(5-oxo-2,5-dihydrofuran-2-ylidene)acetate + H2O
label_lc: 4-oxohex-2-enedioate + h(+) => 2-(5-oxo-2,5-dihydrofuran-2-ylidene)acetate + h2o