Ristocetin A is currently in clinical use to treat bacterial infections [1]. Ristocetin A is an antibiotic which can be used to treat staphylococcal infections. The side effects of ristocetin A include thrombocytopenia and platelet agglutination. Ristocetin A has been used in two assays: the ristocetin cofactor assay and the ristocetin-induced platelet aggregation assay. These two assays could be used to diagnosis the von Willebrand disease and other bleeding disorders [2, 3]. The structural features of Ristocetin A are similar to vancomycin.