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3Synthesis of thiourea derivatives, Pharmaceutical Chemistry Journal Carcinogenesis tests of nitroso-N-methylpiperazine, 2,3,5,6-tetramethyldinitrosopiperazine, nitrosoisonipecotic acid and nitrosomethoxymethylamine in rats, Zeitschrift f??r Krebsforschung und Klinische Onkologie Chronic oral administration of 1-nitrosopiperazine at high doses to MRC rats, Zeitschrift f??r Krebsforschung und Klinische Onkologie