TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The concentration of the hydrogen peroxide solution is 1-60 %mass.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: Preparation process is carried out in solvent in presence of base, fluorination reagent and oxidant. Tamao-Fleming oxidation reaction is carried out at -20 degrees C to 120 degrees C. 5-Amino-3-((3R)-3-(hydroxymethyl)-2-methylidenecyclopentyl)-3H-imidazo(4,5-b)pyridin-7-one-derivative (II) is prepared by performing hydrolysis reaction of 5-amino-3-((3R)-3-(hydroxymethyl)-2-methylidenecyclopentyl)-3H-imidazo(4,5-b)pyridin-7-one-derivative (III) in solvent in presence of acid at 10-80 degrees C, and replacing the substituent R21 in R2 by hydroxyl group. Preferred Composition: The solvent is water, methanol, tetrahydrofuran, ethanol and/or N,N-dimethylformamide. The base is triethylamine, diisopropylethylamine, potassium hydrogencarbonate, sodium hydrogencarbonate and/or cesium hydrogencarbonate. The molar ratio of the base with respect to derivative (II) is 0.5-30. The oxidant is chosen from hydrogen peroxide, peracetic acid, t-butylhydroperoxide, m-chloroperoxybenzoic acid, chlorine, bromine, iodine, N-chlorosuccinimide, N-bromosuccinimide and/or N- iodosuccinimide. The molar ratio of the oxidant with respect to derivative (II) is 0.8-30. The fluorination reagent is sodium fluoride, cesium fluoride, potassium fluoride, hydrogen fluoride and/or boron trifluoride. The molar ratio of the fluorination reagent with respect to derivative (II) is 0.8-30. The acid is protonic acid or Lewis acid. The molar ratio of the acid to derivative (III) is 1-200. The organic solvent used in preparation of derivative (III) is dichloromethane, 1,2-dichloroethane, tetrahydrofuran, 2-methyl tetrahydrofuran, acetonitrile, methanol, ethanol, isopropanol, toluene and/or tert-butyl methyl ether. The protonic acid is hydrochloric acid, sulfuric acid, trifluoroacetic acid, nitric acid, methanesulfonic acid and/or trifluoromethanesulfonic acid. The Lewis acid is boron trifluoride and/or titanium tetrachloride. Preferred Definitions:    R1=group chosen from groups of formulae (1)-(3), preferably of formulae (4)-(13);    n=0-2;    p=0-2;    q=0-2;    X,Y'=C, O or N;    R3=methyl, ethyl, propyl or isopropyl;    R2=group chosen from groups of formulae (17)-(19), preferably of formulae (20)-(29);and    R21=group chosen from groups of formulae (30)-(49).    (i) When n is 0, X is C; and (ii) When p is 0, then Y' is C.