| abstract |
The present invention relates to a compound represented by Formula [I] or a pharmaceutically acceptable salt or ester thereof: n nwherein:n X 1 , X 2 , X 3 , and X 4 , which may be identical or different, are each C or N, provided that none to two of X 1 , X 2 , X 3 , and X 4 is/are N; Y is CH or N; R 1 , R 1 ′, R 2 , R 2 ′, R 3 , R 3 ′, R 4 , and R 4 ′, which may be identical or different, are each a hydrogen atom, a lower alkyl group, or the like; R 5 is a hydrogen atom or a methyl group; R 6 and R 7 , which may be identical or different, are each a hydrogen atom, a lower alkyl group, or the like; R 8 and R 8 ′, which may be identical or different, are each a hydrogen atom, a lower alkyl group, or the like; R 9 is an aryl group or a heteroaryl group which may be substituted; and n is an integer from 1 to 3, and a PLK1 inhibitor or an anticancer agent containing the same. |