RADICICOL DERIVATIVES

摘要

The present invention relates to radicicol derivatives represented by the following formula (I) or pharmacologically acceptable salts thereof: <CHEM> wherein R<1> and R<2> are the same or different and each represents hydrogen, alkanoyl, alkenoyl or tert-butyldimethylsilyl; (1) when X represents halogen, Y represents an oxygen atom or R<4>-O-N (wherein R<4> represents hydrogen or substituted or unsubstituted lower alkyl); and R<3> represents hydrogen, alkanoyl, alkenoyl or the like; and (2) when X and R<3> are combined with each other to represent a single bond; Y represents R<4B>-O-N (wherein R<4B> has the same meaning as R<4>). The radicicol derivatives of the present invention demonstrate tyrosine kinase inhibition activity and pharmacological activities such as antitumor, antimicrobial or immunosuppression effects.