Acitretin, Etretin,C21H26O3 55079-83-9 Acitretin IdentificationName AcitretinSynonyms 9-(4-Methoxy-2,3,6-trimethylphenyl)-3,7-dimethyl-2,4,6,8-nonatetraenoic acid; Etretin Molecular Structure Molecular Formula C21H26O3Molecular Weight 326.43CAS Registry Number 55079-83-9EINECS 259-474-4 Acitretin 55079-83-9