[Collected findings of long-lasting chemical stimulation of the immune system by N-(2-cyanethylene)-urea derivatives (author's transl)].

The present paper describes our findings so far on the long-lasting chemical stimulation of the immune system by means of various batches from the synthesis of N-(2-cyanethylene)-urea (BA 1). These findings were also supported by results of other authors. Furthermore some recent findings have demonstrated that 2-cyanaziridine, 2-cyanethyl-urea and a bicyclic isomer represent examples for immunologically effective BA 1-derivatives or BA 1-isomers, respectively.