 Okay. Let's do this one. So, we were talking about things that will form stable hemiacetals. So, what are the types of molecules if they conform or what will be a stable hemiacetal? Five or six. Five or six membered ring. Okay. So, I want you guys to always remember that. So, what you'll see is that you've got either, you know, carbonyl carbon and an oxygen, an alcohol oxygen, either one, two, three, four, five, six atoms away from each other or five atoms away from each other. This one actually is going to make a six membered ring. Okay. So, very, very stable five and six membered ring. So, remember, hemiacetals are unstable. So, this gives them that extra stability that they need to form. Okay. So, the first step we've got an acid here is going to be the acid-base reaction. All wind steps. Okay. Very fast reaction. Once you get that, super electrophile. You see that super electrophile? It's going to hit itself in the face, right? Bam. But we also have the water out here. Why did it not attack? Because it's not as fast, right? It's easier to, you know, do an intramolecular reaction. And to make that, well, in this case it's going to be a stereocenter, but you're going to get both of the isomers. And if you're having trouble, here, let me put that argument. If you're having trouble making these rings, put numbers on. Okay. We'll do it again. Two, three, four, five, six. Right? So, carbonate carbonate is one. Oxygen is six. Three, four, five. And not the last step, of course, because you're not going to isolate this protonated intermediate. Have that water molecule come over and you do the product, which I'll draw on a different confirmation, just for fun. What kind of molecule is that? What is it? What do you think I mean? What are we making, guys? It's a hemiacetal. You guys are insane.