A novel tetracyclic compound represented by general formula (I) or a pharmacologically acceptable salt thereof. It has a potent immunosuppressive activity and is useful as an immunosuppressant and a remedy for autoimmune diseases.
This invention relates to a novel tetracyclic compound represented by formula (I): ##STR1## or its pharmacologically-acceptable salt. The compound of this invention has strong immunosuppressive activity, and is useful as an immunosuppressive agent and as an agent for treating autoimmune disease.