Synonyms: (3E,3'E)-1,1'-Dimethoxy-3,3',4,4'-tetradehydro-1,1',2,2'-tetrahydro-psi,psi-carotene;.psi.,.psi.-Carotene, 3,3',4,4'-tetradehydro-1,1',2,2'-tetrahydro-1,1'-dimethoxy-;3,3',4,4'-Tetradehydro-1,1',2,2'-tetrahydro-1,1'-dimethoxylycopene;3,3',4,4'-Tetradehydro-1,1',2,2'-tetrahydro-1,1'-dimethoxy-y,y-carotene;psi,psi-Carotene, 3,3',4,4'-tetradehydro-1,1',2,2'-tetrahydro-1,1'-dimethoxy-