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9,13-Di-cis-ra 9,13-retinoic acid Tretinoin EP Impurity B Isotretinoin Impurity 2 9,13-Di-cis-retinoic acid 9-cis,13-cis-Retinoic acid Isotretinoin EP impurity B Retinoic acid, 9-cis, 13-cis- 9-cis,13-cis-Retinoic Acid, ~85% 9,13-Di-cis-Retinoic Acid-13C, d3 Tretinoin Impurity 2（Tretinoin EP Impurity B） Isotretinoin Impurity 2（Isotretinoin EP Impurity B） Isotretinoin EP Impurity B（Tretinoin EP Impurity B） Tretinoin EP Impurity B（Isotretinoin EP Impurity B） Tretinoin EP Impurity B (9,13-di-cis-Retinoic Acid) (2Z,4E,6Z,8E)-3,7-Dimethyl-9-(2,6,6-Trimethyl-1-Cyclohexenyl)Nona-2,4,6,8-Tetraenoic Acid