1,2-Diamino-1,2-dicyanoethylene 18514-52-8 2,3-Diamino-2-butenedinitrile 2,3-Dicyanoethenediamine 2-Butenedinitrile, 2,3-diamino- 51139-01-6 Butenedinitrile, diamino- Diaminomaleonitrile