(3S,4R,9S,10S,11R)-3,10-Bis-(tert-butyl-dimethyl-silanyloxy)-4-(tert-butyl-dimethyl-silanyloxymethyl)-2,2,9,11-tetramethyl-cycloundecanone

(Z)-(1S,6S,7S,8R,11S)-7,11-Bis-(tert-butyl-dimethyl-silanyloxy)-6,8,10,10-tetramethyl-9-oxo-cycloundec-3-enecarboxylic acid