pepa (drug) pepa (drug) pepa is a sulfonamide ampa receptor positive allosteric modulator, which is up to 100 times more potent than aniracetam in vitro. it produces memory-enhancing effects in rats when administered intravenously. pepaclinical dataother namespepalegal statuslegal status us: investigational new drug identifiers iupac name 2-ethyl}thio)phenoxy]acetamide cas number141286-78-4 ypubchem cid6603828chemspider5036138 nunii8s4pr7a8jscomptox dashboard (epa)dtxsid60424960 chemical and physical dataformulac16h16f2n2o4s2molar mass402.43 g·mol−13d model (jsmol)interactive image smiles c1=cc=c(c=c1)s(=o)(=o)nccsc2=cc(=c(c(=c2)f)occ(=o)n)f ny (what is this?) (verify)