This is the dienophile, typically a compound containing a double bond between the α and β carbons and a ketone group.
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8-acetyl-7-(4-bromophenyl)-4-hydroxy-2-oxabicyclo[2.2.2]oct-5-en-3-one
tricarbonyl-{η6-3-(o-methylphenyl)-1-phenylprop-2-en-1-one}chromium
4-(Benzamidoxy)-2-butanone
(E)-3-(6-(4-methoxyphenyl)imidazo[2,1-b]thiazol-5-yl)-1-(3,4,5-trimethoxyphenyl)prop-2-en-1-one
4,4'-(furan-2,5-diyl)bis(4-phenylbutan-2-one)