Exploring Acetyl-carfentanil. To explore a different substance…

Acetyl-carfentanil
Methyl 4-[acetyl(phenyl)amino]-1-(2-phenylethyl)piperidine-4-carboxylate
 1650  C23H28N2O3  380.48
 Fentanyl
 InChI=1S/C23H28N2O3/c1-19(26)25(21-11-7-4-8-12-21)23(22(27)28-2)14-17-24(18-15-23)16-13-20-9-5-3-6-10-20/h3-12H,13-18H2,1-2H3
 KDWNFIZTOZPRAD-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 COC(=O)C1(CCN(CC1)CCc1ccccc1)N(c1ccccc1)C(=O)C