para-iodoamphetamine para-iodoamphetamine para-iodoamphetamine (pia), also known as 4-iodoamphetamine (4-ia), is a research chemical of the phenethylamine and amphetamine chemical classes. para-iodoamphetamineidentifiers iupac name 1-(4-iodophenyl)propan-2-amine cas number21894-72-4 ypubchem cid123870chemspider110407uniic4ul3hte7tcomptox dashboard (epa)dtxsid20897232 chemical and physical dataformulac9h12inmolar mass261.106 g·mol−13d model (jsmol)interactive image smiles cc(cc1=cc=c(c=c1)i)n inchi inchi=1s/c9h12in/c1-7(11)6-8-2-4-9(10)5-3-8/h2-5,7h,6,11h2,1h3key:vzpkowycgwoyrf-uhfffaoysa-n (verify) it acts as a selective serotonin releasing agent and is also a maoi. pia is rumored to be a serotonergic neurotoxin on the account of that being reported to be the case for para-chloroamphetamine. however, pia is a much weaker 5-ht neurotoxin than is the case for pca. analogs 5-iai was an attempt to make a non-neurotoxic analog of pia.