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(4S,5S)-5-[(12R,14R,17S,18R,21S)-12-(Methoxymethoxymethyl)-2-oxo-1,16-diazatetracyclo[10.8.1.014,18.017,21]henicosan-17-yl]-2-oxo-1,3-dioxolane-4-carbonitrile


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