The structure-activity relationships of imidazole derivatives as inhibitors of thromboxane (TX) synthetase were investigated. Introduction of various Substituents (eg, one or two methyl groups, a halogen atom, a methylidene group, unsaturated bonds, or a phenylene group) into the a position or other positions in the carboxy-bearing side chain of 1-(7-carboxyheptyl) imidazole (15) was found to increase the inhibitory potency. The length of the side chains ...