Noncanonical examples of these compounds like AHA and HPG may have azide and alkyne substituents so they can undergo click chemistry. These compounds may be loaded in vivo onto MetRS or added to larger units via amber suppression. Protecting groups like Fmoc (15[1])and BOC may be used when adding these molecules to a larger solid-resin bound constituent in a Robert (*) Merrifield-pioneered technique. Reacting an aldehyde with ammonia and cyanide, then subsequently hydrolyzing the resulting compound produces one of these compounds in the Strecker synthesis. A hydrogen side chain leads to the smallest of these compounds, glycine, being achiral. For 10 points, name these building blocks of proteins. ■END■ (10[1])