Exploring 14388. To explore a different substance…

{4-[Butanoyl(phenyl)amino]-1-[2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]piperidin-4-yl}methyl butanoate
 14388  C30H37N3O5  519.632
 Fentanyl
 InChI=1S/C30H37N3O5/c1-3-10-26(34)33(23-12-6-5-7-13-23)30(22-38-27(35)11-4-2)16-18-31(19-17-30)20-21-32-28(36)24-14-8-9-15-25(24)29(32)37/h5-9,12-15H,3-4,10-11,16-22H2,1-2H3
 RLEUUOVNZPGDGZ-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCCC(=O)N(C1(CCN(CC1)CCN1C(=O)c2c(C1=O)cccc2)COC(=O)CCC)c1ccccc1