2-[2-Methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[ij]quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene]propanedinitrile51325-95-2100 % similar 4-(Dicyanomethylene)-2-methyl-6-(P-dimethylaminostyryl)-4H-pyran51325-91-856 % similar 4-Dicyanomethylene-2,6-dimethyl-4H-pyran28286-88-642 % similar