| 摘要 |
The present invention provides novel methods of inhibition of autoimmune diseases comprising administering to a mammal in need of treatment an effective amount of a compound of formula I wherein R1 and R2 may be the same or different provided that, when R1 and R2 are the same, each is a methyl or ethyl group, and, when R1 and R2 are different, one of them is a methyl or ethyl group and the other is hydrogen or a benzyl group; or a pharmaceutically acceptable salt thereof.
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