furanyl norfentanyl furanyl norfentanyl furanylnorfentanyl is an inactive synthetic opioid analgesic drug precursor. it is an analog of fentanyl. furanyl norfentanylidentifiers iupac name n-phenyl-n-4-piperidinyl-2-furancarboxamide cas number1047187-49-4pubchem cid46744107chemspider22716363 nuniiy28cqj6zb9chemical and physical dataformulac16h18f0n2o2molar mass270.332 g·mol−13d model (jsmol)interactive image smiles o=c(c1=cc=co1)n(c2ccncc2)c3=cc=cc=c3 inchi inchi=1s/c16h18n2o2.clh/c19-16(15-7-4-12-20-15)18(13-5-2-1-3-6-13)14-8-10-17-11-9-14;/h1-7,12,14,17h,8-11h2;1hkey:ctlgggxgcvgioq-uhfffaoysa-n