.beta.-Ethyleniminopropionitrile 1-(2-Cyanoethyl)aziridine 1-(2-Cyanoethyl)ethylenimine 1-Aziridinepropanenitrile 1-Aziridinepropionitrile 1072-66-8 N-(.beta.-Cyanoethyl)ethylenimine N-(2-Cyanoethyl)aziridine NSC7081