4-cyano-3-methyl-2-methylidenebutanoic acid;4-cyano-3-methyl-2-methylene-butanoic acid;4-cyano-3-methyl-2-methylenebutanoic acid;2-(2-cyano-1-methyl-ethyl)acrylic acid;4-cyano-3-methyl-2-methylidene-butanoic acid
4-cyano-3-methyl-2-methylidenebutanoic acid