Well, because of this thyouester bond that connects the carbon and the sulfur. So this is a very high energy bond. And in step two, once we undergo the condensation reaction we'll undergo a hydrolysis reaction in which a water molecule will be used in the enzymes active site to actually cleave the high energy bond forming these two products the citrac molecule and the coenzyme A. And this step essentially releases energy and this is a step that drives this entire step one of the citric acid cycle. So once again, the first step produces a citro coenzyme A complex which contains the six carbon component attached onto the coenzyme A. This reaction is what we call an Aldo condensation.