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methyl (4R,7S)-7-({(3R)-1-[N-(tert-butoxycarbonyl)-L-seryl]-3-hydroxy-L-prolyl}amino)-12,14-bis[(tert-butyl)dimethylsilyloxy]-1,3,4,5,6,7,8,10-octahydro-11-methyl-6,10-dioxo-9,2,5-benzoxathiazacyclododecine-4-carboxylate