4-Dicyanomethylene-2,6-dimethyl-4H-pyran28286-88-6100 % similar 4-(Dicyanomethylene)-2-methyl-6-(P-dimethylaminostyryl)-4H-pyran51325-91-848 % similar Tetracyanoquinodimethane1518-16-744 % similar 2-[2-Methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[ij]quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene]propanedinitrile51325-95-242 % similar Isopropylidenemalononitrile13166-10-438 % similar 2-(1-Ethoxyethylidene)propanedinitrile5417-82-333 % similar