And now let's take that methyl group and place it onto the first position or the second position here. Now, if we place it onto this position, we get back our heptane. The goal is to develop as many structural different compounds as possible. So here's one more isomer. Notice that these two guys have the same exact molecular formula, but they have different structural forms. So now let's take this methyl and place it onto this carbon, and we will get another isomer.