Benzothiazole and benzimidazole containing phthalimide derivatives (NK037, NK041, NK042, NK0139A and NK0148) have been synthesized and their anti-angiogenic activity was evaluated using ex vivo egg yolk angiogenesis model. A comparative study with pure thalidomide (NKTA) has also been performed to describe the efficacy of these derivatives in blocking angiogenesis. NK037, NK041 and NK042 were equally potent in blocking egg ...