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(4R)-1,12-Dioxo-3,4,5,8,9aalpha-pentamethyl-6-methoxy-4beta,4abeta-(epoxymethanoxy)-4,4a,9,9a-tetrahydro-1H-xanthene-2,7-dicarboxylic acid 2-[2-(trimethylsilyl)ethyl]7-(2,2,2-trichloroethyl) ester


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