The citrate is then transformed into isocytrate, another six carbon molecule, which is basically an isomer to citrate. The isocitrate that undergoes step three, that is catalyzed by an allosteric enzyme known as isocytrate, dehydrogenase, and that produces alpha key to glutarate. The alpha key to glutrate, then catalyzed by an enzyme known as alpha key to glutarate, dehydrogenase undergoes step four and other oxidative decarboxylation step to produce a C four molecule, a four carbon molecule known as succinl coenzyme A. And in the next series of steps so in this step, we transform the succinct coenzyme a into succinate. succin is then transformed into fumarrate. Fumarate is then transformed into the lisomer of malate.