dipyanone dipyanone dipyanone is an opioid analgesic which has been sold as a designer drug, first identified in germany in 2021. it is closely related to medically used drugs such as methadone, dipipanone and phenadoxone, but is slightly less potent. not to be confused with dipyrone. dipyanoneidentifiers iupac name 4,4-diphenyl-6-(1-pyrrolidinyl)-heptan-3-one cas number60996-94-3 yuniip8un8d5punchemical and physical dataformulac23h29nomolar mass335.491 g·mol−13d model (jsmol)interactive image smiles ccc(=o)c(cc(c)n1cccc1)(c1ccccc1)c1ccccc1