(S)-2-methyl-4-penten-1-al

(Z)-tert-butyl 3-methoxy-4,4-dimethyl-5-oxohept-2-enoate

tert-butyl (6R,7S,8S,Z)-7-hydroxy-3-methoxy-4,4,6,8-tetramethyl-5-oxoundeca-2,10-dienoate

(Z)-(6R,7S,8S)-3-Methoxy-4,4,6,8-tetramethyl-5-oxo-7-(2,2,2-trichloro-ethoxycarbonyloxy)-undeca-2,10-dienoic acid tert-butyl ester

(6R,7S,8S)-tert-butyl 4,4,6,8-tetramethyl-3,5-dioxo-7-(((2,2,2-trichloroethoxy)carbonyl)oxy)undec-10-enoate