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  • (3S,3aS,9aS,9bS)-3-tert-Butoxy-3a-methyl-7-oxo-6-(2,5,5-trimethyl-[1,3]dioxan-2-ylmethyl)-2,3,3a,4,5,7,8,9,9a,9b-decahydro-1H-cyclopenta[a]naphthalene-8-carboxylic acid

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