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  • Trifluoro-acetic acid (R)-[(1R,6R)-6-hydroxy-7,9-bis-(4-methoxy-benzyl)-5-methylene-8,10-dioxo-7,9-diaza-bicyclo[4.2.2]dec-1-yl]-((S)-2,2,4-trimethyl-[1,3]dioxolan-4-yl)-methyl ester

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