.alpha.-Carboxycaproic acid 1,1-Pentanedicarboxylic acid 2-Butylmalonate 2-Butylmalonic acid 2-n-Butylmalonic acid 534-59-8 Butylmalonate Butylmalonic acid Malonic acid, butyl- NSC791 Propanedioic acid, butyl- n-Butylmalonic acid