1,1'-(Piperazine-1,4-diyldimethylene)diimidazolidine-2-thione 14764-02-4 2-Imidazolidinethione, 1,1'-(1,4-piperazinediyldimethylene)di- EINECS 238-827-6 N,N'-Bis(2-thionoimidazolidin-1-ylmethyl)piperazine