β,β-Difluorofentanyl
N-[1-(2,2-Difluoro-2-phenylethyl)piperidin-4-yl]-N-phenylpropanamide
 8473  C22H26F2N2O  372.451
 Fentanyl
 InChI=1S/C22H26F2N2O/c1-2-21(27)26(19-11-7-4-8-12-19)20-13-15-25(16-14-20)17-22(23,24)18-9-5-3-6-10-18/h3-12,20H,2,13-17H2,1H3
 ZKVYPKCSWWJJAH-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(c1ccccc1)C1CCN(CC1)CC(c1ccccc1)(F)F