Now, under certain circumstances, our cells don't actually want this reaction to take place. And what our cells do is they essentially remove that aldehyde group by reacting it in the process we call glycosidation, which basically transforms that glucose molecule into a glycoside. So what happens is we can basically undergo the process in the presence of alcohol. So let's suppose we have the simplest alcohol methanol. Now, under acidic conditions, for example, in the presence of some type of acid, let's say HCL. So hydrochloric acid, what will happen is the hydrochloric acid will basically protonate this hydroxyl group.