Benzoic acid (E)-(1R,6S,7R)-10-[(2S,4R,6R)-4-(tert-butyl-dimethyl-silanyloxy)-6-ethoxycarbonylmethyl-tetrahydro-pyran-2-yl]-1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-7-hydroxy-6-methyl-9-oxo-dec-2-enyl ester

(4R,6S)-4-(tert-Butyl-dimethyl-silanyloxy)-6-((E)-propenyl)-tetrahydro-pyran-2-one