So we see for our D glucose molecule, which is an example of an aldo HEXOS. HEXOS means we have 123456 carbon atoms, and aldo means we have the aldehyde group on that first carbon. So for D glucose, an example of an aldo HEXOS, the hydroxyl group on the fifth carbon, this blue hydroxyl group on the fifth carbon basically attacks the carbon number one of this carbonyl group that is part of that aldehyde. And we form a mixture of two types of isomers. And these isomers are known as animals. So animals are isomers that differ in this first area, genic carbon, in the arrangement of atoms on this first stereogenic carbon.