| abstract |
A platelet aggregation inhibitor useful as an antithrombotic is provided which consists of a synthetic cyclic pentapeptide containing the tripeptide sequence Arg-Gly-Asp and a thioether linkage in the cycle. A preferred platelet aggregation inhibitor is represented by formula (I), where R1 and R9 are OH; R2, R4, R5, R6, R7, R8 and R14 are hydrogen; R3 and R4 are joined to form a pyrrolidine ring; X is sulfur; m is 1 and n is 3. |