1'-Acetyl-1,3-dihydrospiro(2H-imidazo(4,5-b)pyridine-2,3'-(3H)indol)-2'(1'H)-one 1,3-Dihydro-1'-acetylspiro(2H-imidazo(4,5-b)pyridine-2,3'-(3H)indol)-2'(1'H)-one 40323-53-3 NSC 157962 Spiro(2H-imidazo(4,5-b)pyridine-2,3'-(3H)indol)-2'(1'H)-one, 1,3-dihydro-1'-acetyl-