(1R,3S)-2,2-Dimethyl-3-[[(3E)-2,3,4,5-tetrahydro-2-oxothiophen]-3-ylidenemethyl]cyclopropane-1-carboxylic acid benzyl ester;(1R,3S)-3-[[(E)-Tetrahydro-2-oxothiophene-3-ylidene]methyl]-2,2-dimethylcyclopropanecarboxylic acid benzyl ester
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