3-methylbutanoyl-CoA + malonyl-[ACP] + H(+) => 5-methyl-3-oxohexanoyl-[ACP] + CO2 + CoA
3-methylbutanoyl-coa + malonyl-[acp] + h(+) => 5-methyl-3-oxohexanoyl-[acp] + co2 + coa
3-methylbutanoyl-CoA + malonyl-[ACP] + H(+) => 5-methyl-3-oxohexanoyl-[ACP] + CO2 + CoA
3-methylbutanoyl-coa + malonyl-[acp] + h(+) => 5-methyl-3-oxohexanoyl-[acp] + co2 + coa