preferred_name: 2-oxobutanoate + CO2 => 3-carboxy-2-oxobutanoate + H(+)
preferred_name_lc: 2-oxobutanoate + co2 => 3-carboxy-2-oxobutanoate + h(+)
label: 2-oxobutanoate + CO2 => 3-carboxy-2-oxobutanoate + H(+)
label_lc: 2-oxobutanoate + co2 => 3-carboxy-2-oxobutanoate + h(+)