1-Piperazinepropanenitrile, 4-(2-((2-cyanoethyl)amino)ethyl)- 4-(2-((2-Cyanoethyl)amino)ethyl)piperazine-1-propiononitrile 68310-67-8 EINECS 269-727-0 N-(2-Cyanoethyl)-N'-(2-((2-cyanoethyl)amino)ethyl)piperazine