| abstract |
The present invention provides compounds of general formula (I), their use and methods of synthesis, wherein X is the linkage between CO-hydrazine and NR 1 -oxalic acid or ester groups. These compounds include amino acid derivatives in which the amine group is changed to an acidic group by an oxalic acid group, and the carboxylic acid is changed to an amine functional group by a hydrazine group; and peptide analogs containing the compound and those Represents the synthesis method. |