(2S)-2-isopropyl-3-oxosuccinate + H(+) <=> 4-methyl-2-oxopentanoate + CO2
(2s)-2-isopropyl-3-oxosuccinate + h(+) <=> 4-methyl-2-oxopentanoate + co2
(2S)-2-isopropyl-3-oxosuccinate + H(+) <=> 4-methyl-2-oxopentanoate + CO2
(2s)-2-isopropyl-3-oxosuccinate + h(+) <=> 4-methyl-2-oxopentanoate + co2