(2E,4E,6E,8E)-3-Ethyl-9-(4-methoxy-2,3,6-trimethylphenyl)-7-methyl-2,4,6,8-nonatetraenoic Acid

This compound is a retinoid-related impurity associated with the pharmaceutical intermediate acitretin. It is characterized as a polyenoic acid derivative with a methoxy-substituted trimethylphenyl group, reflecting its structural relationship to the active pharmaceutical ingredient.