The reverse reaction where a cyclohexene derivative breaks down into a diene and dienophile.
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Dimethyl cis-1,2,3,4,4a,5,8,8a-Octahydro-1-oxo-8-(phenylthio)-isoquinoline-2,8a-dicarboxylate
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
