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11-O'-Tert-butyl 4-O'-methyl (4S,9'R,10'S,12'S)-6',9'-dihydroxy-2-oxospiro[1,3-dioxolane-4,8'-14-oxa-1,11-diazatetracyclo[7.4.1.02,7.010,12]tetradeca-2(7),3,5-triene]-4',11'-dicarboxylate


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