Amino acids are molecules that contain $$\(-\mathrm{NH}_{2}\)$$ and -COOH functional groups. Glycine, $$\(\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{COOH}\)$$, is the simplest stable amino acid. Fig. 6.1 shows two syntheses starting with glycine. (i) State the essential conditions for reaction 1. ................................................................................................................................. (ii) Identify the reagent used in reaction 2 . ................................................................................................................................. (iii) Draw the structure of the organic product $$\(\mathbf{U}\)$$ that forms when hippuric acid reacts with an excess of $$\(\mathrm{LiAlH}_{4}\)$$ in reaction 3 . (iv) A molecule of phenylalanine, $$\(\mathbf{R}\)$$, can react with a molecule of glycine to form two dipeptides, $$\(\mathbf{S}\)$$ and $$\(\mathbf{T}\)$$. $$\(\mathbf{S}\)$$ and $$\(\mathbf{T}\)$$ are structural isomers. Draw the structures of these dipeptides. The peptide bond formed should be shown fully displayed.

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