abstract |
The invention provides compounds of the general formula:n (in which R 1 is the residue of glycine or D-alanine, and all other amino-acid residues are in the L-form, X 1 and X 2 , which may be the same or different, are OH or NH 2 and n is 0 or 1) and their physiologically acceptable salts. n The compounds of the invention are capable of inhibit- ing the myelopoietic system of humans and animals, thereby protecting said system against attack by cytotoxic drugs. |