And we'll examine that in a future lecture. So because pathway one is more favorable, it's more stable, it's more likely to take place. And generally, when a reaction can occur in several ways and one of the pathways predominates the reaction is called regioselective. So this reaction is regioselective because pathway one predominates over pathway two. Pathway one is more likely to take place because this intermediate is more stable than this intermediate. Now, in such a reaction, one of the final products predominates, and this is known as reggiospecific reaction.