(Z)-(3R,4S,6S,9S,10R)-4,6-bis(tert-butyldimethylsilanyloxy)-3,9-dimethyl-10-[(1R,3S,6R,7S,8S,9S)-6,8,1-tris(tert-butyldimethylsilanyloxy)-1,3,7,9-tetramethyldecyl]-3,4,5,6,9,10-hexahydro-2H-oxecin-2-one

(1R,2S)-2-methyl-1-[(1R,3S,6R,7S,8S,9S)-6,8,10-tris(tert-butyldimethylsilanyloxy)-1,3,7,9-tetramethyldecyl]but-3-enyl-(2R,3S,5S)-3,5-bis(tert-butyldimethylsilanyloxy)-2-methylhept-6-enoate