The amino acid in which R group is $-{\mathrm{C}\mathrm{H}}_2–\mathrm{ }{\mathrm{C}\mathrm{H}}_2–\mathrm{ }\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$ is

Amino acid contain a variable part 'R' due to which different types of amino acids are seen. This R can any aliphatic or aromatic chain. If R contains COOH then such amino acids are acidic amino acids. Examples are Glutamic and Aspartic acids. In Glutamic acids, R is $–{\mathrm{C}\mathrm{H}}_2–\mathrm{ }{\mathrm{C}\mathrm{H}}_2–\mathrm{ }{\mathrm{C}\mathrm{H}}_2–\mathrm{ }\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$ while in Aspartic acid R is $–\mathrm{ }{\mathrm{C}\mathrm{H}}_2–\mathrm{ }\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$ .