3-allylfentanyl 3-allylfentanyl 3-allylfentanyl is an opioid analgesic that is an analogue of fentanyl. 3-allylfentanyllegal statuslegal status us: schedule i identifiers iupac name n--n-phenylpropanamide cas number86151-80-6 ypubchem cid133866chemspider118047 yuniiv990x77s2ichemical and physical dataformulac25h32n2omolar mass376.544 g·mol−13d model (jsmol)interactive image smiles o=c(n(c1ccccc1)3ccn(ccc2ccccc2)c3c\c=c)cc inchi inchi=1s/c25h32n2o/c1-3-11-22-20-26(18-16-21-12-7-5-8-13-21)19-17-24(22)27(25(28)4-2)23-14-9-6-10-15-23/h3,5-10,12-15,22,24h,1,4,11,16-20h2,2h3/t22-,24+/m0/s1 ykey:bzxkqffmdltpjl-ladgpheksa-n y ny (what is this?) (verify) 3-allylfentanyl has similar effects to fentanyl. side effects of fentanyl analogs are similar to those of fentanyl itself, which include itching, nausea and potentially serious respiratory depression, which can be life-threatening. fentanyl analogs have killed hundreds of people throughout europe and the former soviet republics since the most recent resurgence in use began in estonia in the early 2000s, and novel derivatives continue to appear.