(3-Methoxy-2-propenylidene)propanedinitrile (3-Methoxyallylidene)malononitrile 1,1-Dicyano-4-methoxy-1,3-butadiene 3-Methoxyallylidenemalonitrile 52718-96-4 EINECS 258-129-5 Propanedinitrile, (3-methoxy-2-propenylidene)-