1-[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl]-1,3-dihydro-2H-benzimidazol-2-one,1-[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl]-1,3-dihydro-2H-benzimidazol-2-one,Orally active anti-allergic agent; related structurally to cinnarizine and having a novel biphasic mode of action.,Oxatomide API