How to I identify the diene and dienophile through retrosynthesis of a given compound? I'm stuck while finding what to use to make this compound:



My first attempt was to use a triple bond as dienophile and a ring as my diene, as shown below -



But I'm not sure if this is right.
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!