Diels-Alder reaction question

In class, we learned that Diels-Alder reactions only occurs with s-cis conformations and that conformations like those in cyclopentadiene are permanently locked in a cis-transformation and that is why they are so reaction. We also learned that the reaction proceeds at a higher rate with an electro-withdrawing substituent (eg. carbonyl) . Why then is a molecule like the one in the figure not reactive while a similar structure, a cyclopentadienone, is?[![enter image description here](https://i.stack.imgur.com/D1mEd.png)](https://i.stack.imgur.com/D1mEd.png)




You need to draw this structure in a 3D visualizer program, eg, Avogadro. While this structure looks similar to cyclopentadiene, in 3D it looks vastly different.
[![enter image description here](https://i.stack.imgur.com/c7xFd.jpg)](https://i.stack.imgur.com/c7xFd.jpg)


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