(2-amino-3-cyano-4H-chromen-4-yl)malononitrile InChI=1/C13H8N4O/c14-5-8(6-15)12-9-3-1-2-4-11(9)18-13(17)10(12)7-16/h1-4,8,12H,17H propanedinitrile, (2-amino-3-cyano-4H-1-benzopyran-4-yl)-