Chlorine is shown to possess anti-gastric ulcer activity,since it can inactivate Helicobacter pylori,which is regarded as one of the most common risk factors for causing gastric problems.In the current study,the gastroprotective property of a novel dichloro-substituted Schiff base complex,2,2’-[-1,2-cyclohexanediylbis(nitriloethylidyne)]bis(4-chlorophenol) (CNCP),against alcoholinduced gastric lesion in SD rats was assessed.SD rats were divided into four groups,i.e.normal,ulcer control,testing,and reference groups.Ulcer area,gastric wall mucus,and also gastric acidity of the animal stomachs were measured.In addition,antioxidant activity of CNCP was evaluated and its safe dose was identified.Immunohistochemistry staining was also carried to evaluate two important proteins,i.e.Bcl2-associated X protein (Bax) and heat shock protein 70 (HSP70).Moreover,the activities of super oxide dismutase and catalase,as well as the levels of prostaglandin E2 (PGE2) and malondialdehyde (MDA) were also measured.Antioxidant activity of CNCP was approved via the aforementioned experiments.Histological evaluations showed that the compound possesses stomach epithelial defense activity.Additionally,periodic acid-Schiff staining exhibited over-expression of HSP70 and down-expression of Bax protein in the CNCP-treated rats.Moreover,CNCP caused deceased MDA level and elevated PGE2 level,and at the same time increased the activities of the two enzymes.