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(8R,11S)-11-{[(2S,3R)-1-((S)-2-tert-Butoxycarbonylamino-3-hydroxy-propionyl)-3-hydroxy-pyrrolidine-2-carbonyl]-amino}-2,4-dihydroxy-1-methyl-10,14-dioxo-5,7,8,9,10,11,12,14-octahydro-13-oxa-6-thia-9-aza-benzocyclododecene-8-carboxylic acid