So this entire purple region came from the urine triphosphate and the pyrophosphate, the remaining Pyrophosphate was essentially kicked off. So this is the Pyrophosphate that was kicked off from the urine triphosphate. And the remaining portion of that urine triphosphate basically was attached onto this molecule to form the uriidine diphosphate UDP glucose. Now, the purpose of this was to create this high energy bond that is very reactive because as we'll see in just a moment, this is able to actually undergo the reaction which we attach it onto that growing glycogen chain. Now, the pyrophosphate that is formed in the presence of water, which is basically found in the cytoplasma baristalis, will undergo a hydrolysis reaction in which this bond will be cleaved and will form two orthophosphate molecules. Now, this is the reaction that actually drives the formation of UDP glucose.