Steroids are naturally occurring polycyclic compounds classified as lipids.The Diels-Alder reaction has been widely used in their preparation.Shown below is a precursor molecule used in a total steroid synthesis.What combination of diene and dieneophile can be used to prepare this compound through the use of a Diels-Alder cycloaddition reaction. 
Definitions:
Non-Nucleoside Reverse
A class of antiretroviral drugs used to treat HIV by inhibiting the reverse transcriptase enzyme without mimicking nucleosides.
HIV Replication
The process by which the Human Immunodeficiency Virus duplicates its genetic material within a host's cells, spreading the infection.
Viral Protein
Proteins coded for by viral genes that are critical for the virus life cycle, including structure, replication, and evasion of host defenses.
Leukemia
A type of cancer affecting the blood and bone marrow, characterized by the overproduction of abnormal white blood cells.
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