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Droperidol EP Impurity E Droperidol Impurity E HCl Droperidol EP Impurity E HCl Droperidol Impurity 5（Droperidol EP Impurity E） 4-Desfluoro-4-[4-(2-Oxo-2,3-dihydro-1H-benziMidazol-1-yl)-3,6-dihydropyridin-1(2H)-yl] Droperidol 1-[1-[4-[4-[4-(2-Oxo-2,3-dihydro-1H-benziMidazol-1-yl)-3,6-dihydropyridin-1(2H)-yl]-1-oxobutyl]phenyl]-1,2,3,6-tetrahydro-4-pyridinyl]-1,3-dihydro-2H-benziMi 1-(1-(4-(4-(4-(2-oxo-2,3-dihydro-1H-benzo[d]imidazol-1-yl)-3,6-dihydropyridin-1(2H)-yl)butanoyl)phenyl)-1,2,3,6-tetrahydropyridin-4-yl)-1,3-dihydro-2H-benzo[d]imidazol-2-one