| abstract |
A novel phenanthrene derivative of general formula (1), its salt, a compound further derived therefrom, and its salt; a process for the production thereof; and an interleukin 1 (IL-1) inhibitor containing the derivative as the active ingredient, wherein (a) represents (b) wherein R' represents hydrogen or lower alkyl, (c) wherein R?2 represents hydrogen or lower alkanoyl, or (d) wherein R?2 is as defined above. |