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Methanesulfonic acid (2S,3R,4S,5R,6R,7R)-5-benzyloxy-2-{(R)-2-benzyloxy-2-[(4R,5S,6R)-2,2,5-trimethyl-6-((S)-1-methyl-allyl)-[1,3]dioxan-4-yl]-propyl}-7-(tert-butyl-dimethyl-silanyloxy)-3-hydroxy-4,6-dimethyl-nonyl ester