(3R,4S,7R,11R,12R,15S)-1,16-bis-(tert-butyldimethylsilyloxy)-11,12-epoxy-3,7,11,15-tetramethyl-4-hexadecyl benzyl ether

(3R,4S,7R,11S,12S,15S)-1,16-bis-(tert-butyldimethylsilyloxy)-11,12-epoxy-3,7,11,15-tetramethyl-4-hexadecyl benzyl ether