| abstract |
Peptides of the formula: <IMAGE> wherein X represents a neutral or acidic L- alpha -amino acid residue; A represents hydrogen or an acyl, alkoxycarbonyl, aralkoxycarbonyl, alkyl or aralkyl amino-protecting group; B represents hydrogen or an acyl, alkyl, aralkyl, alkoxycarbonyl or aralkoxycarbonyl phenolic hydroxy-protecting group; Y and W independently represent a neutral L- alpha -amino acid residue C represents hydroxy, amino or a group of the formula OR, NHR, NR2 or NH-NH-R' wherein R represents a straight chain, branched chain or cyclic alklyl group having up to 11 carbon atoms, phenyl or C7-C14 aralkyl and R' represents hydrogen, any of the groups which R may represent, a straight chain, branched chain or cyclic aliphatic acyl group having from 1 to 11 carbon atoms, a straight chain, branched or cyclic alkoxycarbonyl group having from 3 to 11 carbon atoms, or an aralkoxycarbonyl group. |