Carfentanil N-oxide
4-(Methoxycarbonyl)-N-phenyl-1-(2-phenylethyl)-N-propanoylpiperidin-4-amine N-oxide
 8298  C24H30N2O4  410.506
 Fentanyl
 InChI=1S/C24H30N2O4/c1-3-22(27)26(29,21-12-8-5-9-13-21)24(23(28)30-2)15-18-25(19-16-24)17-14-20-10-6-4-7-11-20/h4-13H,3,14-19H2,1-2H3
 AIPCICZMXFEBPO-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 COC(=O)C1(CCN(CC1)CCc1ccccc1)N(=O)(c1ccccc1)C(=O)CC