2f-viminol 2f-viminol 2f-viminol is a pyrrole derived opioid analgesic drug, which was originally developed by a team at the drug company zambon in the 1960s. it is around twice as potent as the parent compound viminol, though unlike viminol, 2f-viminol has never passed clinical trials or been approved for medical use. 2f-viminol has been sold as a designer drug, first being identified in sweden in 2019. it is one of a number of structurally atypical opioid agonists to have appeared on the designer drug grey-market since broad controls over fentanyl analogues were introduced in china in 2015. it was made illegal in sweden in august 2019 and in latvia in november 2019. 2f-viminollegal statuslegal status uk: under psychoactive substances act illegal in sweden and latvia identifiers iupac name 2--1-pyrrol-2-yl]ethanol cas number63880-43-3 ypubchem cid57419227chemspider84400601uniik5w46p6zpechemical and physical dataformulac21h31fn2omolar mass346.490 g·mol−13d model (jsmol)interactive image smiles fc1=c(cn2c=cc=c2c(o)cn(c(cc)c)c(c)cc)c=cc=c1 inchi inchi=1s/c21h31fn2o/c1-5-16(3)24(17(4)6-2)15-21(25)20-12-9-13-23(20)14-18-10-7-8-11-19(18)22/h7-13,16-17,21,25h,5-6,14-15h2,1-4h3key:fxqmnnhpoywwki-uhfffaoysa-n