(1?S,1?S,2R,4S,10E,12E,14S)-8?-chloro-1?-hydroxy-8?,14-dimethoxy-2,7,10-trimethyl-12,6-dioxo-7-aza-1(6,4)-oxazinana-3(2,3)-oxirana-8(1,3)-benzenacyclotetradecaphane-10,12-dien-4-yl N-(4-mercapto-4-methylpentanoyl)-N-methyl-L-alaninate;
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