(2E,4E)-(6R,7S)-7-(tert-Butyl-dimethyl-silanyloxy)-7-((2R,3R)-3-formyl-oxiranyl)-2,4,6-trimethyl-hepta-2,4-dienoic acid ethyl ester

(2E,4E,6R,7S)-ethyl 7-(tert-butyldimethylsilyloxy)-7-((2R,3S)-3-((R)-1-hydroxybut-3-enyl)oxiran-2-yl)-2,4,6-trimethylhepta-2,4-dienoate

(6R,7R,2E,4E,8E)-7-(tert-butyldimethylsilyloxy)-10-hydroxy-2,4,6-trimethyldeca-2,4,8-trienoic acid ethyl ester

(4R,5R,2E,6E)-5-(tert-butyldimethylsilyloxy)-8-(4-methoxybenzyloxy)-2,4-dimethylocta-2,6-dienoic acid ethyl ester

(6R,7R,2E,4E,8E)-7-(tert-butyldimethylsilyloxy)-10-(4-methoxybenzyloxy)-2,4,6-trimethyldeca-2,4,8-trienoic acid ethyl ester