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  • {3-[1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2-[1-(2-{[3-methyl-2-(4-nitro-benzyloxycarbonylamino)-butyrylamino]-methyl}-tetrahydro-furan-3-ylsulfanylcarbonyl)-ethyl]-4-oxo-azetidin-1-yl}-oxo-acetic acid 4-nitro-benzyl ester

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