Exploring 14389. To explore a different substance…

{1-[2-(1,3-Dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]-4-[(2-methylpropanoyl)(phenyl)amino]piperidin-4-yl}methyl 2-methylpropanoate
 14389  C30H37N3O5  519.632
 Fentanyl
 InChI=1S/C30H37N3O5/c1-21(2)26(34)33(23-10-6-5-7-11-23)30(20-38-29(37)22(3)4)14-16-31(17-15-30)18-19-32-27(35)24-12-8-9-13-25(24)28(32)36/h5-13,21-22H,14-20H2,1-4H3
 QEEAFVCKZLXQPU-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 O=C(C(C)C)OCC1(CCN(CC1)CCN1C(=O)c2c(C1=O)cccc2)N(C(=O)C(C)C)c1ccccc1