etymemazine etymemazine etymemazine is an antipsychotic, antihistamine and anticholinergic drug of the phenothiazine chemical class, structurally related to cyamemazine and methotrimeprazine. etymemazineclinical dataahfs/drugs.cominternational drug namesatc codenoneidentifiers iupac name 3-(2-ethylphenothiazin-10-yl)-n,n,2-trimethylpropan-1-amine cas number523-54-6hcl: 3737-33-5 ypubchem cid71823chemspider64847unii861j4k81c7hcl: a7002e7t2z ychemblchembl1967567comptox dashboard (epa)dtxsid0046935 chemical and physical dataformulac20h26n2smolar mass326.50 g·mol−13d model (jsmol)interactive image smiles ccc(c=c3)=cc2=c3sc1=cc=cc=c1n2cc(c)cn(c)c inchi inchi=1s/c20h26n2s/c1-5-16-10-11-20-18(12-16)22(14-15(2)13-21(3)4)17-8-6-7-9-19(17)23-20/h6-12,15h,5,13-14h2,1-4h3key:uskhclaxjxcwmo-uhfffaoysa-n (verify) synthesis patents: sodamide sn2 alkylation between 2-ethylphenothiazine (1) and 1-dimethylamino-2-methyl-3-chloropropane (2) furnishes the etymemazine (3).