It attacks the carbon of this carbonyl, breaking this unstable bond, and that releases that coenzyme a, and it forms an intermediate molecule known as succinal phosphate. So in step one, we displace the coenzyme a, we release the coenzyme a from the active side, and so we produce this product in step one. Once we form the succinct phosphate within the active side of this enzyme, we have a specific catalytic histazine residue that basically catalyzes the next step. And so the two electrons of the nitrogen of this catalytic histazine residue basically acts as a nucleophile attacking the p atom. And that breaks the sigma bond. And so that detaches this entire four carbon component.