“…They are accessible through the reaction of coordinated N-Acylthiourea with acid chlorides, followed by further derivatisation. Members of this family are known chelating agents (Hartung et al, 1985), with potential applications e.g., radio pharmaceuticals ( 99m Tc) (Abram et al, 1989). A large number of serine proteinase inhibitors has been developed, starting from benzamidine and its derivatives (Ensinck et al, 1972;Henkel et al, 1983;Jeffcoate and White, 1974).…”