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(3S,3aS,6R,9S,9aS,9bS)-3,6,9-trimethyl-6-(trimethylsilyloxy)-3a,4,5,9,9a,9b-hexahydroazuleno[4,5-b]furan-2,8(3H,9bH)-dione
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(3S,3aS,6R,8S,9S,9aS,9bS)-8-hydroxy-3,6,9-trimethyl-6-(trimethylsilyloxy)-3a,4,5,6,8,9,9a,9b-octahydroazuleno[4,5-b]furan-2(3H)-one
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(3S,3aS,6R,8R,9S,9aS,9bS)-8-hydroxy-3,6,9-trimethyl-6-(trimethylsilyloxy)-3a,4,5,6,8,9,9a,9b-octahydroazuleno[4,5-b]furan-2(3H)-one