N-Phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]-2-oxo-4-carboxybutanamide
5-[{1-[2-(4-Hydroxy-3-methoxyphenyl)ethyl]piperidin-4-yl}(phenyl)amino]-4,5-dioxopentanoic acid
 11463  C25H30N2O6  454.516
 Fentanyl
 InChI=1S/C25H30N2O6/c1-33-23-17-18(7-8-21(23)28)11-14-26-15-12-20(13-16-26)27(19-5-3-2-4-6-19)25(32)22(29)9-10-24(30)31/h2-8,17,20,28H,9-16H2,1H3,(H,30,31)
 VLDRFTHXYAQMBI-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 COc1cc(CCN2CCC(CC2)N(C(=O)C(=O)CCC(=O)O)c2ccccc2)ccc1O