(Phenylamino)(4-phenylpiperazinyl)methane-1-thione (Phenylamino)(4-phenylpiperazinyl)methane-1-thione; . 1-Piperazinecarbothioamide, N,4-diphenyl- 1-Piperazinecarbothioamide,N,4-diphenyl- N,4-diphenylpiperazine-1-carbothioamide N,4-Diphenyltetrahydro-1(2H)-pyrazinecarbothioamide