A novel series of indoline derivatives with imidazole and carboxyl moieties were synthesized and evaluated for their thromboxane A 2 (TXA 2) synthetase inhibiting, radical scavenging and anti-peroxidative activities. Among the compounds synthesized, 3-{5-substituted-3-[2- (imidazol-1-yl) ethyl] indolin-1-yl} propionic acids showed free radical scavenging activity and inhibitory effects on lipid-peroxidation of rat brain homogenate and on arachidonate- ...