| abstract |
A pyrazoloquinolone derivative having kinase inhibitory activity. It is a compound represented by the formula (I) [wherein R1 represents optionally substituted aryl or optionally substituted aromatic heterocyclic group; R2 represents hydrogen, optionally substituted amino, optionally substituted hydroxy, or optionally substituted thiol; and R3, R4, R5, and R6 are the same or different and each represents (1) hydrogen, (2) nitro, (3) cyano, (4) halogeno, (5) an optionally substituted hydrocarbon group, (6) optionally substituted amino, (7) optionally substituted hydroxy, or (8) optionally substituted thiol, provided that R3, R4, and R5 may be bonded respectively to R4, R5, and R6 to form a ring in cooperation with the adjacent carbon atoms] or a salt of the compound. |