So it will stay long enough for the bond to form. And the way that the bond forms is so we can label these carbon atoms as carbon atom one, carbon atom two, carbon atom three, carbon atom four, and carbon atom five on this sugar molecule. And we have the three prime hydroxyl group acts as a nucleophile and attacks this innermost phosphorus atom of this incoming nucleuside triphosphate. And it forms a covalent bond between the oxygen and this phosphorus. Now eventually this H atom is removed and this Pyrophosphate molecule is kicked off. And so in the process when we form the phosphodieester bond and we form this polynucleotide chain, we essentially release a single pyrophosphate molecule and as we'll see in a future lecture the hydrolysis of the pyrophosphate molecule essentially drives this reaction forward.