So let's go on to discuss what happens when we have 2 or more chiral centers. If we have 2 or more chiral centers and all of them are identical, the molecules will still be identical. For example, if I have a molecule that has 3 chiral centers and the chiral centers are configured as 2R, 3R, 5S. And then I'm comparing it to another molecule that has the same molecular formula, same connectivity, and it happens to be 2R, 3R, and 5S as well. Those are going to be identical.
How about if all centers are precisely different? What if I was comparing it to 2S, 3S, 5R? In this scenario, where every single center is opposite, these molecules are going to be enantiomers as well. We have covered this a bit when I talked about the types of stereo isomers you could have. If everything is completely different, that results in an enantiomer.
But what if not all of them are different but not all of them are the same? Consider the situation where I have 2R, 3R, and then have 5R. Here, I have two centers that are the same, but one is different. What kind of situation would that be? Well, that would fall into the category of neither being the same nor completely different. They are not mirror images, but they still differ. This is a diastereomer. If they're somewhat different but somewhat the same, that would classify as a diastereomer. Does that make sense, guys?