Succinic acid (2S,3R,6S,8R,9S)-8-[(2E,4E)-(6S,7S)-6,8-bis-(tert-butyl-dimethyl-silanyloxy)-3,7-dimethyl-octa-2,4-dienyl]-3-butyl-2-ethynyl-9-methyl-1,7-dioxa-spiro[5.5]undec-3-yl ester 2-trimethylsilanyl-ethyl ester

(4E,6E)-(2R,3S)-8-[(2R,3S,6S,8S,9R)-9-Butyl-9-(tert-butyl-dimethyl-silanyloxy)-8-ethynyl-3-methyl-1,7-dioxa-spiro[5.5]undec-2-yl]-3-hydroxy-1-((S)-4-isopropyl-2-thioxo-oxazolidin-3-yl)-2,6-dimethyl-octa-4,6-dien-1-one