ethyl (2E,4E,6Z,8E)-8-[4-methyl-3,4-dihydro-1(2H)-naphthalen-1-ylidene]-3,7-dimethyl-2,4,6-octatrienoate

ethyl (2E,4E)-6-(5,6,7,8-tetrahydro-3,5,5,8,8-pentamethyl--2-naphthalenyl)-3,7-dimethyl-2,4,6-octatrienoate

3-diazoacetoxy-9-cis-retinal

(2E,4E,6Z)-7-(3-Ethoxy-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-3-methyl-octa-2,4,6-trienoic acid ethyl ester