Patent ID: 8163952

Claim:
At least one chemical entity chosen from compounds, salts, and optical isomers of formula (I): in which: R 1 is chosen from hydrogen, alkyl radicals containing from 1 to 4 carbon atoms and R 2 is an alkyl radical containing from 1 to 4 carbon atoms, or, alternatively, R 1 and R 2 form, together with the nitrogen atom N to which they are attached, a heterocycle of piperidine or pyrrolidine type, R 3 is an alkyl radical containing from 1 to 4 carbon atoms, R 4 is chosen from hydrogen, alkyl radicals containing from 1 to 4 carbon atoms, and halogens, R 5 is chosen from hydrogen and a hydroxyl radical, and R 6 is chosen from hydrogen and alkyl radicals containing from 1 to 4 carbon atoms.