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(1S,9R)-2'-Oxo-8-(benzyloxy)-1,2,3,9aalpha-tetrahydro-1beta,2beta-epiminospiro[9H-pyrrolo[1,2-a]indole-9,4'-[1,3]dioxolane]-6,10-dicarboxylic acid 6-methyl 10-tert-butyl ester


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