| 摘要 |
The present invention provides a benzenoid ansamycin derivative represented by Formula (I) (wherein R1 and R2 each represent a hydrogen atom or are combined together to form a bond, R8 represents a bond or an oxygen atom, R11 represents hydroxy, substituted or unsubstituted lower alkoxy or substituted or unsubstituted lower alkanoyloxy, R15 represents a hydrogen atom or methoxy, R22 represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkanoyl or substituted or unsubstituted aroyl, R4 and R5 each represent a hydrogen atom or are combined together to form a bond, R18 represents a hydrogen atom, or the like, R21 represents hydroxy or the like, and R17 and R19 may be the same or different and each represents a hydrogen atom, or the like) or a pharmaceutically acceptable salt thereof.
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