thereof and the like protection of the amino group can be accomplished by methods well known to those familiar with amino acid chemistry for example the amino group be protected utilizing a carbonyl compound represented by the formula wherein r u2032 represents alkyl radicals having from 1 to about 10 carbon atoms and aryl aralkyl and alkaryl radicals having from about 6 to about 26 carbon atoms or aryl or alkylaryl or aralkyl with suitable carbon numbers a represents oxygen n is 0 or 1 and q represents cl br i or c o a n r u2032 wherein r u2032 a and n have the same meanings as defined above exemplary amino protecting groups are acyl groups including such groups as acetyl benzoyl formyl propionyl butyryl toluyl and may include substituted such groups for example nitrobenzoyl and the like in other words the amino protecting groups are those commonly used as blocking groups in peptide synthesis c 3 c 7 cycloalkyl means cyclic hydrocarbon groups containing 3 to 7 carbon atoms such as cyclopropyl cyclobutyl cyclopentyl cyclohexyl methyl cylopentyl methyl cyclohexyl dimethyl cyclopentyl cycloheptyl and the like ar is an aromatic group which means a phenyl substituted phenyl tolyl substituted tolyl naphthyl and the like substituted phenyl and substituted tolyl means from one to three substituents such as alkyl carboxyl hydroxyl and base salts thereof alkoxy halogen which means fluoro chloro bromo or iodo.