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Tert-butyl 3-[[(12S,15S,18S)-7-bromo-18-[3-[tert-butyl(dimethyl)silyl]oxypropyl]-4-chloro-13-methyl-15-[4-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]butyl]-11,14,17-trioxo-2-thia-4,10,13,16,19-pentazatricyclo[19.4.0.03,8]pentacosa-1(25),3(8),6,21,23-


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