abstract |
(57) [Problem] To provide a novel imidazopyridine derivative having excellent antitumor activity. SOLUTION: embedded image R 1 is substituted phenyl, substituted heterocycle, etc .; R 2 is hydrogen atom, aliphatic acyl, etc .; R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are hydrogen, alkyl group, halogen atom, etc .; 1 represents O, S, etc. |