Lofentanil
Methyl 3-methyl-1-(2-phenylethyl)-4-[phenyl(propanoyl)amino]piperidine-4-carboxylate
 3198 ·  C25H32N2O3 ·  408.533
 Fentanyl
 InChI=1S/C25H32N2O3/c1-4-23(28)27(22-13-9-6-10-14-22)25(24(29)30-3)16-18-26(19-20(25)2)17-15-21-11-7-5-8-12-21/h5-14,20H,4,15-19H2,1-3H3
 IMYHGORQCPYVBZ-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(C1(CCN(CC1C)CCc1ccccc1)C(=O)OC)c1ccccc1