2-methylpropanoyl-CoA + malonyl-[ACP] + H(+) = 4-methyl-3-oxopentanoyl-[ACP] + CO2 + CoA
2-methylpropanoyl-coa + malonyl-[acp] + h(+) = 4-methyl-3-oxopentanoyl-[acp] + co2 + coa
2-methylpropanoyl-CoA + malonyl-[ACP] + H(+) = 4-methyl-3-oxopentanoyl-[ACP] + CO2 + CoA
2-methylpropanoyl-coa + malonyl-[acp] + h(+) = 4-methyl-3-oxopentanoyl-[acp] + co2 + coa