| abstract |
Compounds represented by the general formula [I] or pharmaceutically acceptable salts or esters thereof; and PLK1 inhibitors and anticancer drugs, containing the same: [I] wherein X, X, X and X are each independently C or N (with the proviso that zero to two of X, X, X and X are N); Y is CH or N; R, R , R, R , R, R , Rand R are each independently hydrogen, lower alkyl, or the like; R is hydrogen or methyl; R and R are each independently hydrogen, lower alkyl, or the like; R and R are each independently hydrogen, lower alkyl, or the like; R is optionally substituted aryl or heteroaryl; and n is an integer of 1 to 3. |