Isophthalonitrile626-17-531 % similar 1-Methyl-2-(2-nitroethenyl)-pyrrole3156-50-131 % similar Methyl N-methyl-2-pyrrolylacetate51856-79-231 % similar 1,4-Dicyanobenzene623-26-731 % similar 2,3-Dicyanonaphthalene22856-30-030 % similar 2,6-Pyridinedicarbonitrile2893-33-630 % similar