| abstract |
The present invention relates to a compound represented by formula (I) and a prodrug thereof, a pharmaceutical salt or solvate of the compound or the prodrug, wherein X 1 to X 5 and R 1 to R 5 are Defined in the description. The invention also relates to a pharmaceutical composition comprising a compound of formula (I) and a method of treating a hyperproliferative disorder in a mammal by administering a compound of formula (I). [Chemical 1] |