2,4,6,8-Nonatetraenoic acid, 9-(4-hydroxy-2,3,6-trimethylphenyl-3,7-dimethyl-, ethyl ester, (all-E)- 4-Hydroxyetretinate 66757-07-1 9-(4-Hydroxy-2,3,6-trimethylphenyl)-3,7-dimethyl-2,4,6,8-nonatetraenoic acid, ethyl ester CCRIS 5519 Ro 11-4768