Synonyms: b,y-Caroten-4-one,3',4'-didehydro-1',2'-dihydro-1'-hydroxy- (9CI); g-Caroten-4-one,3',4'-didehydro-1',2'-dihydro-1'-hydroxy-, all-trans- (8CI);1',2'-Dihydro-1'-hydroxy-4-ketotorulene; 2-Deoxydeinoxanthin; 4-Oxo-1',2'-dihydro-1'-hydroxytorulene;Deoxyflexanthin