So we have a negative charge here. So what an alpha amino acid is, if it's basically a molecule that contains a sensor carbon, that is an alpha carbon. And so it contains this carboxylic acid group that has been deprotonated as shown in the following diagram. And not only that, the other group attached to this center alpha carbon is an amino group that has been protonated. Now we'll see why this is protonated and why this is deprotonated in just a moment. So we have this other amino group, as shown in the diagram.