"Normal" octane would be:

H H H H H H H H
H C C C C C C C C H
H H H H H H H H


Isn't organic chemistry what chemists that can't understand the periodic
table do?

You know the difference between an organic chemist and a computer?
You have to punch information into both of them, but with a computer you
only have to do it once!

:)
Peter