Exploring Thiofentanyl. To explore a different substance…

Thiofentanyl
N-Phenyl-N-{1-[2-(thiophen-2-yl)ethyl]piperidin-4-yl}propanamide
 2626  C20H26N2OS  342.498
 Fentanyl
 InChI=1S/C20H26N2OS/c1-2-20(23)22(17-7-4-3-5-8-17)18-10-13-21(14-11-18)15-12-19-9-6-16-24-19/h3-9,16,18H,2,10-15H2,1H3
 YMRFZDHYDKZXPA-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(c1ccccc1)C1CCN(CC1)CCc1cccs1