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methyl 7-tosyloxy-4-methyl-3-heptenoate
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(2α,3aβ,5α,7aα)-(+/-)-5-bromooctahydro-2-hydroxy-4,4,7a-trimethylbenzofuran

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(E)-6-((R)-3,3-Dimethyl-oxiranyl)-4-methyl-hex-3-enoic acid tert-butyl ester