label: 2-(hydroxymethyl)-4-oxobutanoate + acetate + NH4(+) + CO2 => 2-(acetamidomethylene)-3-(hydroxymethyl)succinate + 2 H2O + H(+)
label_lc: 2-(hydroxymethyl)-4-oxobutanoate + acetate + nh4(+) + co2 => 2-(acetamidomethylene)-3-(hydroxymethyl)succinate + 2 h2o + h(+)