Haloperidol EP Imp H (or) Haloperidol N-Oxide ;
4-[4-(4-Chlorophenyl)-4-hydroxy-1-oxido-1-piperidinyl]-
1-(4-fluorophenyl)-1-butanone ; 4-[-4-(4-Chlorophenyl)-
4-hydroxy-1-oxido-1-piperidinyl]-1-(4-fluorophenyl)-1-butanone