Abstract: The present application provides use of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof in manufacture of a medicament useful in treating a disease related to high expression or abnormal activation of JAK and SYK kinases, comprising an autoimmune disease, such as an immune-mediated skin disease, in particular psoriasis, atopic dermatitis and SLE. Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof according to the present invention can improve the skin lesions in mice with psoriasis, atopic dermatitis and SLE, alleviate the injury of kidney, inhibit the expansion of immune organs, reduce the level of inflammation, inhibit the increase of SLE related antibodies and cytokines in serum, and has a certain safe therapeutic window, which has a good clinical application prospect.

Abstract: The present application provides application of butylphthalide or optical isomer, prodrug, deuterium, metabolite, and ring-opening product or ring-opening product salt thereof in the preparation of a drug for preventing, alleviating, or treating peripheral neuropathy, especially chemotherapy-induced peripheral neuropathy, and a use method of butylphthalide and a derivative thereof in preventing or treating peripheral neuropathy, especially chemotherapy-induced peripheral neuropathy. In vivo and in vitro studies show that the drug of the present invention can effectively prevent, alleviate, or treat peripheral neuropathy caused by chemotherapy drugs without affecting the tumor-inhibiting efficacy and pharmacokinetic properties of the chemotherapy drugs.