2,4,6,8-Nonatetraenamide, N-(4-hydroxyphenyl)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl-, (all-E)- FENRETINIDE N-(4-hydroxyphenyl)retinamide NSC374551 all-trans-4'-hydroxyretinanilide