etonitazepyne etonitazepyne etonitazepyne (n-pyrrolidino etonitazene) is a benzimidazole derivative with potent opioid effects which has been sold over the internet as a designer drug and linked to numerous cases of overdose. etonitazepynelegal statuslegal status de: npsg (industrial and scientific use only) uk: under psychoactive substances act us: schedule i identifiers iupac name 2--5-nitro-1-(2-pyrrolidin-1-ylethyl)benzimidazole pubchem cid155804760chemspider103835282unii8hy67jq9zhchemical and physical dataformulac22h26n4o3molar mass394.475 g·mol−13d model (jsmol)interactive image smiles (=o)c1cc2nc(cc3ccc(occ)cc3)n(ccn3cccc3)c2cc1 inchi inchi=1s/c22h26n4o3/c1-2-29-19-8-5-17(6-9-19)15-22-23-20-16-18(26(27)28)7-10-21(20)25(22)14-13-24-11-3-4-12-24/h5-10,16h,2-4,11-15h2,1h3key:lqzwzcjcepukcj-uhfffaoysa-n