So this is the bond formed between the blue oxygen and the green carbon. Now, this basically becomes a hydroxyl group shown here. So this is carbon number two. This is carbon number two. This is carbon number three, carbon number 3456 and so forth. Now, notice that we actually have a mixture of two types of isomers, and we form this mixture of two types of isomers we call atomers, the alpha atomer and the beta atomer.