We have 1234, and so we're going to have two bromo, three chloro, and then since we have four chain carbon backbone, we have butane. Okay, so now let's look at the final molecule. In this final molecule, we have two identical substituents, and that means we're going to want to use a diprefix. So this is a terriblel substituent. So let's find our longest straight chain. So 1234-5678.