Exploring 8499. To explore a different substance…

3-Hydroxy-N-phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]propanamide
 8499  C22H28N2O2  352.47
 Fentanyl
 InChI=1S/C22H28N2O2/c25-18-14-22(26)24(20-9-5-2-6-10-20)21-12-16-23(17-13-21)15-11-19-7-3-1-4-8-19/h1-10,21,25H,11-18H2
 BXGSQUNMZMHPKS-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 OCCC(=O)N(c1ccccc1)C1CCN(CC1)CCc1ccccc1