2,3-Epoxypropiononitrile 2-Cyanoethylene oxide 4538-51-6 5-18-06-00004 (Beilstein Handbook Reference) BRN 0103951 CCRIS 6496 Cyanoethylene oxide Cyanooxirane EINECS 224-887-0 GLYCIDONITRILE Glycidic acid nitrile Oxirane carbonitrile