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carbonic acid allyl ester 6-(tert-butyl-dimethyl-silanyloxy)-17-ethyl-19-(6-methoxy-3-methyl-3,6-dihydro-2H-pyran-2-yl)-3,5,7,11,15-pentamethyl-8-oxo-9-triisopropylsilanyloxymethyl-nonadeca-2,10,12,16,18-pentaenyl ester