ap-238 ap-238 ap-238 is an opioid designer drug related to drugs such as azaprocin and bucinnazine, with around the same potency as morphine. it was first discovered in italy in the 1960s but was never marketed, subsequently appearing on the illicit market around 2020 and being detected in both slovenia and the usa. ap-238legal statuslegal status uk: under psychoactive substances act us: the dea is not of the opinion that ap-237 and derivatives are controlled substances, or analogues thereof. identifiers iupac name 1-piperazin-1-yl]propan-1-one cas number(racemic) 4204-01-7 (racemic) 140924-11-4 (2r,6s enantiomer)pubchem cid124389619chemspider4941886uniin26wml8ar7chemical and physical dataformulac18h26n2omolar mass286.419 g·mol−13d model (jsmol)interactive image smiles ccc(=o)n1(cn(c1c)c/c=c/c2=cc=cc=c2)c inchi inchi=1s/c18h26n2o/c1-4-18(21)20-15(2)13-19(14-16(20)3)12-8-11-17-9-6-5-7-10-17/h5-11,15-16h,4,12-14h2,1-3h3/b11-8+/t15-,16+key:jelnwdoxwgbblo-qjbcgikssa-n