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Tert-butyl N-[(5S,9R,10R,13R,14S)-18-[tert-butyl(dimethyl)silyl]oxy-10-hydroxy-13,14-dimethyl-7,16-dioxo-6,8,15-trioxatricyclo[15.4.0.05,9]henicosa-1(17),2,11,18,20-pentaen-20-yl]-N-ethylcarbamate


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