# Confusion with E/Z configuration

Could someone please illustrate how to determine the E/Z configuration of this molecule?

What I understand so far is that if the two highest priority substituent on each side are on the same side, then it's Z and vice versa.

Now, how can I handle such a structure? I've considered it and I thought it might be $$\ce{CH-CH3}$$ on one side (up), and $$\ce{CH2CH2}$$ on the other. However, I don't think it's right.

Bottom line is that I don't understand how to fractionate the ring into two substituents.

• This molecule has not isomers about the double bond. Simple as this. Dec 27 '19 at 8:25