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  • (8R,11S)-11-[((2S,3R)-1-tert-Butoxycarbonyl-3-hydroxy-pyrrolidine-2-carbonyl)-amino]-2,4-bis-(tert-butyl-dimethyl-silanyloxy)-1-methyl-10,14-dioxo-5,7,8,9,10,11,12,14-octahydro-13-oxa-6-thia-9-aza-benzocyclododecene-8-carboxylic acid methyl ester

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