| 摘要 |
Compounds represented by general formula (I) or salts thereof, (wherein R1 represents a member selected from the group consisting of CH2, CH2CH2, CH2O, CH2S and CH2SO; R2 represents hydrogen, lower (C1-4) alkyl or benzyl; R3 represents COOR4, NHCOR5, CONR6R7, PO3H2 or SO3H; and n is an integer of from 1 to 4) which are useful as a remedy for autoimmune diseases such as systemic lupus erythematosus or nephritis such as glomerulonephritis.
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