1-(phenylmethyl)-2-piperazin-1-ylbenzimidazole 1-(phenylmethyl)-2-piperazin-1-yl-benzimidazole 1-(phenylmethyl)-2-(1-piperazinyl)benzimidazole 1-(benzyl)-2-piperazin-1-yl-benzimidazole 143257-98-1 Lerisetron Lerisetron [INN] 1-Benzyl-2-(1-piperazinyl)benzimidazole