1-(2,5-Dichlorobenzenesulfonyl) 4-(3,4-dichlorophenyl) piperazine [French] 1-(3,4-Dichlorophenyl)-4-((2,5-dichlorophenyl)sulfonyl)piperazine 197166-39-5 Piperazine, 1-(3,4-dichlorophenyl)-4-((2,5-dichlorophenyl)sulfonyl)-