69049-06-5 71124-01-1 Alfenta Alfentanil hydrochloride Alfentanil hydrochloride [USAN] Alfentanil hydrochloride anhydrous EINECS 273-846-3 N-(1-(2-(4-Ethyl-4,5-dihydro-5-oxo-1H-tetrazol-1-yl)ethyl)-4-(methoxymethyl)piperidin-4-yl)-N-phenylpropionamide hydrochloride Propanamide, N-(1-(2-(4-ethyl-4,5-dihydro-5-oxo-1H-tetrazol-1-yl)ethyl)-4-(methoxymethyl)-4-piperidinyl)-N-phenyl-, monohydrochloride R 39209 Rapifen