1-(Diphenylmethyl)piperazine 1-Benzhydrylpiperazine 841-77-0 Benzhydrylpiperazine N-(Diphenylmethyl)piperazine N-Benzhydrylpiperazine NSC35536 Norcyclizine Normethylcyclizine Piperazine, 1-(diphenylmethyl)-