The structure below is an intermediate along the way to the production of synthetic
morphine.It is produced through a Diels-Alder cycloaddition reaction.Which
combination of diene and dieneophile will result in its preparation? 
Definitions:
Diagonal Path
A line segment that connects two non-adjacent corners in a polygon or polyhedron.
Release
The act of making something available to the public, or allowing a substance, energy, etc., to emerge.
Ball
A spherical object; in mathematics, the set of all points in space at or below a certain distance from a given point.
Rectangle
A four-sided shape that has four 90-degree angles, with its opposing sides being parallel and of the same length.
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