The invention of the present application provides a compound represented by Formula (I) or a salt thereof, which exhibits an inhibitory activity against at least one kinase selected from the group consisting of Akt kinase, Rsk kinase, and S6K kinase and/or a cell proliferation inhibiting effect and is useful as a prophylactic and/or therapeutic agent for diseases associated with the above-mentioned kinases, particularly cancer. [In the formula, R 1 represents a 4- to 6-membered monocyclic unsaturated heterocyclic group which has 1 to 3 hetero atoms independently selected from N, S and O and may have a substituent； R 2 represents a hydrogen atom or the like； R 3 , R 4 , and R 5 , may be the same as or different from one another and independently represent a hydrogen atom or the like； R 6 represents a hydrogen atom or the like； R 7 and R 8 , may be the same as or different from each other and independently represent a hydrogen atom or the like； X 1 and X 2 may be the same as or different from each other and independently represent N or CR 9 ； R 9 represents a hydrogen atom or the like； and X 3 represents N or CH when the broken line ( ----- ) represents a single bond, and represents C when a broken line indicates a double bond, wherein at least one of X 1 or X 2 represents N.]
