(2E,10E,12E)-(4S,5S,6S,8R,14S,15R)-5-(tert-Butyl-dimethyl-silanyloxy)-4,6,8,14-tetramethyl-9-oxo-15-(tetrahydro-pyran-2-yloxy)-heptadeca-2,10,12-trienoic acid methyl ester

(E)-(4S,5S,6S,8R)-5-(tert-Butyl-dimethyl-silanyloxy)-8-chlorocarbonyl-4,6-dimethyl-non-2-enoic acid methyl ester

protomycinolide IV