Remifentanil
Methyl 1-(3-methoxy-3-oxopropyl)-4-[phenyl(propanoyl)amino]piperidine-4-carboxylate
 2633  C20H28N2O5  376.447
 Fentanyl
 InChI=1S/C20H28N2O5/c1-4-17(23)22(16-8-6-5-7-9-16)20(19(25)27-3)11-14-21(15-12-20)13-10-18(24)26-2/h5-9H,4,10-15H2,1-3H3
 ZTVQQQVZCWLTDF-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 COC(=O)C1(CCN(CC1)CCC(=O)OC)N(c1ccccc1)C(=O)CC