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Acetic acid (2R,3S,4S,5R)-4,5-bis-(tert-butyl-dimethyl-silanyloxy)-2-((Z)-(1R,4S,5R,9R,11S,12S)-1,11-dihydroxy-5-isopropyl-8,12-dimethyl-15-oxa-tricyclo[10.2.1.04,9]pentadeca-2,7,13-trien-2-ylmethoxy)-tetrahydro-pyran-3-yl ester