SEARCH Articles Figures Tables 1.3- Oxazoline-4-carboxylic acid 2-Oxazolines protecting groups 2-oxazoline-4-carboxylate A protective group A-Carboxyl group Acids carboxyl group Carboxyl groups acidity Carboxyl groups, protection Carboxyl groups, protection Carboxylic acids Carboxyl protecting groups Carboxylic acid groups Carboxylic acids oxazolines Carboxylic acids, protection Protective groups acids Protective groups carboxylic acids