So we generate NADH, we kick off an H ion and we form this six membered molecule known as ortate. So this ring is ultimately going to be used, as we'll see in just a moment, to synthesize that primidine. So once we synthesize the orotate, what do we do next? Well, now we can attach the sugar component onto this orotate and the molecule that we use at that sugar component is PRPP, where PRPP stands for phosphoribacyl pyrophosphate. And the enzyme that catalyzes this is primidine. Phosphoribacy transfers.