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1-((2R,3R,4S,5R)-5-{(S)-[(S)-2-tert-Butoxycarbonylamino-2-((4S,5S)-5-carbamoyloxymethyl-2,2-dimethyl-[1,3]dioxolan-4-yl)-acetylamino]-carboxy-methyl}-3,4-dihydroxy-tetrahydro-furan-2-yl)-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid