2-dicyanomethylene-3-cyano-4,5,5-trimethyl-2,5-dihydrofurane;2-dicyanomethylene-3-cyano-4-methyl-5,5-dimethyl-2,5-dihydrofuran;2-dicyanomethylidene-4,5,5-trimethyl-2,5-dihydrofuran-3-carbonitrile;
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