Deducing the reactants of a Diels$-$Alder reaction

Ethan

Can the molecule on the right$-$hand side of this organic reaction be made in good yield from no more than two reactants, in one step, by moderately heating the reactants?

If your answer is yes, then draw thereactant or reactants in the drawing area below. You can draw the reactants in any arrangement you like.

If your answer is no$,$ check the box under the drawing area instead.