And to describe the stereo chemistry of sugar molecules correctly, the most common mechanism we use are the fissure projections. So fissure projections are commonly used to describe the stereo chemistry, the three dimensional arrangement of the atoms and the bonds within the sugar molecule. And to see what the fissure projection actually looks like, let's take a look at the following molecules. So this is the same molecule that we essentially described here. It's the de urethras. So in this particular diagram, the problem with this diagram is all the atoms essentially lie along the same plane and all the bonds also lie along the same plane.