part of part of has input has input has output has output process 2-oxobutanoate from pyruvate: step 3/3 1 1 1 1 1 1 1 EC:1.1.1.n5 enzymatic_reaction UPa:UER00069 1 D-erythro-3-methylmalic acid + 1 NAD(+) => 1 2-oxobutanoate + 1 CO(2) + 1 H(+) + 1 NADH. 2-oxobutanoate from pyruvate NAD(+) NADH CO(2) H(+) 2-oxobutanoate D-erythro-3-methylmalic acid