Elamod (T-6 14) is a new drug for the treatment of rheumatoid arthritis developed by Toyama Chemical Industry Co., Ltd., Japan, and its structure has been disclosed in the patent JP 6225425 1987. Simcere holds the patent of crystal form and composition (CN 201010236615.6), and applied for the patent of sustained-release capsules of Elamodo and composition of Elamodo/hydroxychloroquine on 20 15 and 20 17, but the patent has not been obtained.