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(3aR,4R,5aR,9aS,9bS)-4-((4aR,8R,8aS)-2,2-Dimethyl-4,4a,8,8a-tetrahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-8,8-dimethyl-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalen-2-one
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(3aR,4R,5aR,9aS,9bS)-4-((4aR,8R,8aS)-2,2-Dimethyl-4,4a,8,8a-tetrahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-8,8-dimethyl-2-oxo-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalene-3-carboxylic acid tert-butyl ester