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(3S,6R,7S,8S)-3,7-bis(tert-butyldimethylsilyloxy)-11-{(4R,5R)-5-[(S,E)-2-(tert-butyldimethylsilyloxy)-3-methyl-4-(2-methylthiazol-4-yl)but-3-enyl]-2,2,4-trimethyl-1,3-dioxolan-4-yl}-1-hydroxy-4,4,6,8-tetramethylundecan-5-one
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(3S,6R,7S,8S)-3,7-bis(tert-butyldimethylsilyloxy)-11-{(4R,5R)-5-[(S,E)-2-(tert-butyldimethylsilyloxy)-3-methyl-4-(2-methylthiazol-4-yl)but-3-enyl]-2,2,4-trimethyl-1,3-dioxolan-4-yl}-4,4,6,8-tetramethyl-5-oxoundecanoic acid