CAS No.: 69427-46-9 Synonyms: (2 Z ,4 E ,6 E ,8 E )-9-(4-Methoxy-2,3,6-trimethylphenyl)-3,7-dimethylnona-2,4,6,8-tetraenoic acid; 13- cis -Acitretin; Isoacitretin Formula: C₂₁H₂₆O₃ Formula Weight: 326.43 Linear Formula: C₂₁H₂₆O₃