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(1As,8S)-2'-Oxo-7-(benzyloxy)-9-hydroxy-1aalpha,2,9,9aalpha-tetrahydro-1H-3alpha,9alpha-epoxyspiro[8H-azirino[2,3-c][1]benzoazocine-8,4'-[1,3]dioxolane]-1,5-dicarboxylic acid 1-tert-butyl 5-methyl ester


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