After structure-activity relationship studies (SAR) on a novel class of substituted thiazolo(3,2-b)(1,2,4)triazin-7-ones, HWA-131 (3-(3,5-di-tert.butyl-4-hydroxyphenyl)-7H-thiazolo(3,2-b)(1,2,4)triaz in-7-one) was selected for incremental pharmacological investigations. This compound was effective in not only preventing, but also curing established arthritic disorders of rats such as adjuvant and type II collagen arthritis as well as those of mice such as chronic graft-versus-host (CGVH) disease, a model for systemic lupus erythematosus (SLE).
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