70879-28-6 71195-58-9 Alfentanil hydrochlorid-1-wasser Alfentanil hydrochloride monohydrate N-(1-(2-(4-Ethyl-5-oxo-2-tetrazolin-1-yl)-ethyl)-4-(methoxymethyl)-4-piperidyl)propionanilide monohydrochloride monohydrate Propanamide, N-(1-(2-(4-ethyl-4,5-dihydro-5-oxo-1H-tetrazol-1-yl)ethyl)-4-(methoxymethyl)-4-piperidinyl)-N-phenyl, monohydrochloride, monohydrate