Malonic acid; malonic acid esters; malonic acid salts; malonic acid amides; dimethyl malonate; diethyl malonate; chemical substances for industrial use, namely, ethyl malonate, mono-methyl malonate, mono-ethyl malonate, mono-propyl malonate, mono-butyl malonate, mono-tert-butyl malonate, di-alkyl malonate esters, namely, dimethyl malonate, diethyl malonate, dipropyl malonate, dibutyl malonate, dialkyl malonate, dialkylated 1,3-dicarbonyl compounds, namely, diethyl 2,2-dimethylmalonate, diethy...