R 39209-d3;Rapifen-d3;Alfentanyl-d3;Alfentanil-d3;Alfentanyl-d3 Hydrochloride;Alfentanil-d3 Hydrochloride;N-[1-[2-(4-Ethyl-4,5-dihydro-5-oxo-1H-tetrazol-1-yl)ethyl]-4-[(methoxy-d3)methyl]-4-piperidinyl]-N-phenyl-propanamide;N-[1-[2-(4-Ethyl-4,5-dihydro-5-oxo-1H-tetrazol-1-yl)ethyl]-4-(methoxy-d3)methyl-4-piperidinyl]-N-phenyl-propanamide Hydrochloride
