Exploring 2-Hydroxycarfentanil acid. To explore a different substance…

2-Hydroxycarfentanil acid
2-Hydroxy-1-(2-phenylethyl)-4-[phenyl(propanoyl)amino]piperidine-4-carboxylic acid
 13704  C23H28N2O4  396.479
 Fentanyl
 InChI=1S/C23H28N2O4/c1-2-20(26)25(19-11-7-4-8-12-19)23(22(28)29)14-16-24(21(27)17-23)15-13-18-9-5-3-6-10-18/h3-12,21,27H,2,13-17H2,1H3,(H,28,29)
 OUCFFQCXOYJRPN-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(C1(CCN(C(C1)O)CCc1ccccc1)C(=O)O)c1ccccc1