Exploring 14376. To explore a different substance…

{1-[2-(4-Ethyl-5-oxo-4,5-dihydro-1H-tetrazol-1-yl)ethyl]-4-[phenyl(propanoyl)amino]piperidin-4-yl}methyl propanoate
 14376  C23H34N6O4  458.554
 Fentanyl
 InChI=1S/C23H34N6O4/c1-4-20(30)29(19-10-8-7-9-11-19)23(18-33-21(31)5-2)12-14-26(15-13-23)16-17-28-22(32)27(6-3)24-25-28/h7-11H,4-6,12-18H2,1-3H3
 DUVHMJHDBVUBNX-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)OCC1(CCN(CC1)CCn1nnn(c1=O)CC)N(c1ccccc1)C(=O)CC