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The tautomeric properties of an N-(3,4-dichlorophenyl)-1H-indazole-5-carboxamide (NTZ-1006, 2) derivative, developed as highly potent, reversible and selective MAO-B inhibitor useful for the treatment of Parkinson’s disease (PD) and other neurological disorders, have been studied both experimentally and theoretically. The theoretical data (M06?2X, B3LYP and MP2-4 quantum chemical calculations) have shown that due to aromaticity reasons the 1H tautomer strongly dominates over the 2H form. There are no substantial spectral changes by changing the solvent and the concentration, which leads to a conclusion that compound 2 exists in solution as 1H tautomer and its tautomerism is not influenced by the solvents and the concentration. The results are in line with the understanding for the tautomerism of 1H-indazole and shows that substitution at the C5 position in the indazole unit does not influence the tautomeric state. The isolated crystal structure of 2 is in an excellent agreement with the computation in respect of the most stable tautomer. Combined single X-ray/molecular modeling studies including HYdrogen-DEsolvation (HYDE) analysis provided not only insights into the enzyme?inhibitor interaction within the binding site of the human MAO-B isoform, but also a valuable information regarding the most stable 1H-indazole tautomeric form of NTZ-1006 that contributes to its high potency against hMAO-B enzyme (IC50 0.586 nm) and selectivity (>17000-fold) over the hMAO-A isoenzyme.
One of the oldest and most widely used commercial enzyme inhibitors is aspirin, Application of 360575-29-7, which selectively inhibits one of the enzymes involved in the synthesis of molecules that trigger inflammation. you can also check out more blogs about Application of 360575-29-7
Reference：
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem