(E)-(3R,4S,8R,9S,12R)-3,9-Bis-(tert-butyl-dimethyl-silanyloxy)-12-[(2S,3S,6R,8S,9R)-8-((S)-4-hydroxy-3-methyl-pentyl)-3,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-yl]-4-methoxy-2,8-dimethyl-tridec-5-en-7-ol

(2S,2(3S),3R,6R,8R,8(1S),9S)-3,9-dimethyl-2-(3-(2-methyl-1,3-dithian-2-yl)butyl)-8-(1-methyl-2-(phenylsulfonyl)ethyl)-1,7-dioxaspiro(5,5)undecane

(S)-5-((2S,3R,6R,8R,9S)-3,9-dimethyl-8-((S)-1-(phenylsulfonyl)propan-2-yl)-1,7-dioxaspiro[5.5]undecan-2-yl)-3-methylpentan-2-one

(R)-3-((tert-butyldimethylsilyl)oxy)-3-(4-methyl-2,5-dioxo-2,5-dihydrofuran-3-yl)propanoic acid