How to I identify the diene and dienophile through retrosynthesis of a given compound?
The $\ce{CO3}$ substituents are questionable. Let's assume that this is $\ce{CO2Me}$ instead!

Since this is homework, I won't provide a full solution but:


Note that double bond patterns may isomerize (in the direction of conjugation).
Alkynes can serve as dienophiles too!