-Hydroxy Fentanyl;b-Hydroxy Fentanyl;N-[1-(2-Hydroxy-2-phenyl-ethyl)-piperidin-4-yl]-N-;N-[1-(2-Hydroxy-2-phenylethyl)-4-piperidinyl]-N-phenylpropanamide;Propanamide, N-[1-(2-hydroxy-2-phenylethyl)-4-piperidinyl]-N-phenyl-;N-[1-(2-HYDROXY-2-PHENYL-ETHYL)-PIPERIDIN-4-YL]-N-PHENYL-PROPIONAMIDE;N-[1-(2-Hydroxy-2-phenyl-ethyl)-piperidin-4-yl]-N-phenyl-propionamideRESTRICTED MATERIAL