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Methyl (2S,3aS,3'aS,6S,6'R,6'aS)-2,2',2'-trimethyl-6'-[(4R)-2-oxo-1,3-dioxolan-4-yl]spiro[3,3a,4,5-tetrahydropyrrolo[1,2-b][1,2]oxazole-6,4'-6,6a-dihydro-3aH-furo[3,4-d][1,3]dioxole]-2-carboxylate


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