[Synthesis of a modified analog of a native lipotripeptide from the E. coli bacterial wall]

The following prospective immunomodulators, aliphatic derivatives of amino acids and peptides, were synthesized: N-palmitoyl-L-cysteine, N-palmitoyl-S-[1,2-bis(hexadecyloxycarbonyl)ethyl]-L-cysteine, N-palmitoyl-S-[1,2-bis(hexadecyloxycarbonyl)ethyl]-L-cysteinyl-L-s erine, and N-palmitoyl-S-[1,2-bis(hexadecyloxycarbonyl) ethyl]-L-cysteinyl-L-seryl-L-serine.