Exploring 3135. To explore a different substance…

N-(2-Fluorophenyl)-N-[1-(2-phenylethyl)-4-(pyridin-2-yl)piperidin-4-yl]propanamide
 3135  C27H30FN3O  431.545
 Fentanyl
 InChI=1S/C27H30FN3O/c1-2-26(32)31(24-13-7-6-12-23(24)28)27(25-14-8-9-18-29-25)16-20-30(21-17-27)19-15-22-10-4-3-5-11-22/h3-14,18H,2,15-17,19-21H2,1H3
 SLPKWZPZSWFZQV-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(C1(CCN(CC1)CCc1ccccc1)c1ccccn1)c1ccccc1F