piperidine-2-carboxylic acid 11,13-bis-(tert-butyl-dimethyl-silanyloxy)-16-carboxy-1-[2-(2,3-dimethoxy-5-methoxymethoxy-2,3-dimethyl-octahydro-benzo[1,4]dioxin-6-yl)-1-methyl-ethyl]-4,12-dimethyl-heptadeca-5,9-dienyl ester