(2R)-ethylmalonyl-CoA + H(+) <=> butanoyl-CoA + CO2
(2r)-ethylmalonyl-coa + h(+) <=> butanoyl-coa + co2
(2R)-ethylmalonyl-CoA + H(+) <=> butanoyl-CoA + CO2
(2r)-ethylmalonyl-coa + h(+) <=> butanoyl-coa + co2