1-Methylpiperidyl-4-benzhydrylether hydrochloride 132-18-3 4-Diphenylmethoxy-1-methylpiperidine hydrochloride Allerzine Belfene hydrochloride Diafen Diafen hydrochloride Diafen, antihistamine Diaphen Diphenpyraline hydrochloride Diphenylpyraline hydrochloride Hispril hydrochloride Histalert NSC61825 Piperidine, 4-(diphenylmethoxy)-1-methyl-, hydrochloride Sumadil