The same E1 -E2 -E3 multienzyme structure found in the pyruvate dehydrogenase and the -ketoglutarate dehydrogenase complexes

The same E1 -E2 -E3 multienzyme structure found in the pyruvate dehydrogenase and the α-ketoglutarate dehydrogenase complexes is also used in the branched-chain α-ketoacid dehydrogenase complex, which participates in the catabolism of branched chain amino acids. Draw the reaction product when the following substrate is acted on by the branched chain α-keto acid dehydrogenase complex.