research of diverse antioxidants as protective agents. An efficient synthesis of three novel benzophenones containing 1,3-thiazol moiety (6a–c) is described. Their antioxidant power was evaluated in vitro and in three cell lines (the cancerous MCF7 and the non-cancerous hTERT-HME1 mammary cells, and the H9c2 cardiomyoblastic cells). One analogue 5-(2,5-dihydroxybenzoyl)-2(3H)-benzothiazolone (6c), displayed