(E)-3,7-Dimethyl-9-(2,6,6-trimethyl-3-oxo-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenoic acid 38030-57-8 4-Ketoretinoic acid 4-Oxo-all-trans-retinoic acid 4-Oxoretinoic acid 4-oxo-Tretinoin Retinoic acid, 4-oxo- Ro 12-4824 all-trans-4-Oxo-retinoic acid