The present invention relates to a compound according to formula (I) or pharmaceutically acceptable salts, hydrates, or solvates thereof; wherein R1is C1-alkyl, R2is C1-alkyl, R3is C2-alkyl, R4is hydrogen, R5is hydrogen. The invention relates further to said compounds for use in therapy, to pharmaceutical compositions comprising said compounds, to said compounds for use in the treatment autoimmune diseases and to intermediates for the preparation of said compounds.本發明係關於式(I)化合物 或其醫藥上可接受之鹽、水合物或溶劑合物;其中R1係C1-烷基,R2係C1-烷基,R3係C2-烷基,R4係氫,R5係氫。本發明進一步係關於該等化合物用於療法中、包含該等化合物之醫藥組合物、該等化合物用於治療自體免疫疾病及用於製備該等化合物之中間體。