fluorophen fluorophen fluorophen, or fluorofen, is a fluorinated analogue of phenazocine, an opioid drug of the benzomorphan group, which was developed as a radioligand for the purpose of labeling opioid receptors during pet scans (with 18f). unlike most other benzomorphan derivatives, fluorophen acts as a full agonist of the opioid receptors with preferential affinity for the μ-opioid receptor (approximately 6x that of morphine), similar but slightly lower affinity for the δ-opioid receptor (equipotent to enkephalin), and very low affinity for the κ-opioid receptor. fluorophenclinical dataatc codenoneidentifiers iupac name (1r,9s,13r)-10--1,13-dimethyl-10-azatricyclotrideca-2,4,6-trien-4-ol cas number86495-14-9pubchem cid3036297chemspider2300351comptox dashboard (epa)dtxsid501006862 chemical and physical dataformulac22h26fnomolar mass339.454 g·mol−13d model (jsmol)interactive image smiles fc1ccc(cc1)ccn43cc2c(cc(o)cc2)(3c)(cc4)c inchi inchi=1s/c22h26fno/c1-15-21-13-17-5-8-19(25)14-20(17)22(15,2)10-12-24(21)11-9-16-3-6-18(23)7-4-16/h3-8,14-15,21,25h,9-13h2,1-2h3/t15-,21-,22+/m0/s1key:pupfatugtiqbqa-uzqplgkssa-n