Identify the key intermediates that will be required to construct the cyclopentenone ring in the target molecule. In this case, you'll need a suitable alkyne, an alkene, and a carbonyl group to undergo the Pauson-Khand reaction.
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(3R,4R)-3,4-dimethyl-3-(p-tolyl)cyclopentanone
(S)-3-{(2S,3R)-2-[(1R,2R)-4-Benzyloxy-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-butyl]-5-methoxy-tetrahydro-furan-3-yl}-2-methyl-propan-1-ol
acetic acid (E)-4-benzyloxy-1-cyanobut-2-enyl ester
