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(8R)-9alpha-Hydroxy-2H-3,9-epoxy-2'-oxo-7-(benzyloxy)-1aalpha,9aalpha-dihydrospiro[1H-azirino[2,3-c][1]benzoazocine-8(9H),4'-[1,3]dioxolane]-1,5-dicarboxylic acid 1-tert-butyl 5-methyl ester


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