Exploring 3125. To explore a different substance…

N-(2-Fluorophenyl)-N-[4-phenyl-1-(2-phenylethyl)piperidin-4-yl]propanamide
 3125  C28H31FN2O  430.557
 Fentanyl
 InChI=1S/C28H31FN2O/c1-2-27(32)31(26-16-10-9-15-25(26)29)28(24-13-7-4-8-14-24)18-21-30(22-19-28)20-17-23-11-5-3-6-12-23/h3-16H,2,17-22H2,1H3
 DBAISLXCWSRVSD-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(C1(CCN(CC1)CCc1ccccc1)c1ccccc1)c1ccccc1F