Product Name: Acitretin Synonyms: all-trans-Etretin Chemical Name: all-trans-9-(4-Methoxy- 2,3,6- trimethylphenyl)- 3,7-dimethyl-2,4,6,8- nonatetraenoic acid; CAS No.: 55079-83-9 Molecular Formula: C21H26O3 Molecular Weight: 326.43 Standard: EP4 Specifications: Appearance: Yellow to greenish crystalline powder Assay : 98.0 to 102.0%