PROBLEM TO BE SOLVED : To provide specific benzopyridazine derivatives. SOLUTION : The invention provides compounds represented by formula (I) in the figure. (In the formula, M represents N; R1 represents NR5R5, an optionally substituted carbocycle, an optionally substituted heterocycle such as indole, or the like; each of R2 and R3 independently represents halogen, an alkyl group, or the like; each R5 independently represents H, an alkyl group, or the like; and R6 represents H or an alkyl group.) SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT