3-METHYLFENTANYL 42045-86-3 DEA No. 9813 F 7209 Mefentanyl N-(3-Methyl-1-(2-phenylethyl)-4-piperidinyl)-N-phenylpropanamide N-(3-Methyl-1-(2-phenylethyl)-4-piperidyl)-N-phenylpropanamide Propanamide, N-(3-methyl-1-(2-phenylethyl)-4-piperidinyl)-N-phenyl-