Exploring β-Oxo-carfentanil. To explore a different substance…

β-Oxo-carfentanil
Methyl 1-(2-oxo-2-phenylethyl)-4-[phenyl(propanoyl)amino]piperidine-4-carboxylate
 8366  C24H28N2O4  408.49
 Fentanyl
 InChI=1S/C24H28N2O4/c1-3-22(28)26(20-12-8-5-9-13-20)24(23(29)30-2)14-16-25(17-15-24)18-21(27)19-10-6-4-7-11-19/h4-13H,3,14-18H2,1-2H3
 BHIYWXAOQDVJSZ-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(C1(CCN(CC1)CC(=O)c1ccccc1)C(=O)OC)c1ccccc1