A compound of formula (I) ** Formula ** in which R1 is hydrogen, chlorine, methyl or methoxy, R2 is hydrogen or methoxy, provided that at least one of R1 and R2 is different from hydrogen, G1 represents chlorine , (C1-C4) alkyl, (C1-C4) alkoxycarbonyl, member aza-heteroaryl or the group -CH2- OR3, -CH2-NR4R5 or -C (>； = O) -NR4R6, where R3 is hydrogen, alkyl (C1-C4) or cycloalkyl (C3-C6) or phenyl, (i) said (C1-C4) alkyl is optionally substituted with hydroxy, (C1-C4) alkoxy, hydroxycarbonyl, (C1-C4) alkoxycarbonyl, amino, aminocarbonyl , mono- (C1-C4) -alkyl-aminocarbonyl, di-alkylaminocarbonyl (C1-C4) -, cycloalkyl (C3-C6) or up to three fluorine atom, and (ii) said cycloalkyl (C3-C6) is optionally substituted with one or two substituents independently selected from the group consisting of (C1-C4) alkyl, hydroxy and amino, and (iii) said phenyl is optionally substituted with one or two substituents independently selected from the group which with it consists of fluorine, chlorine, bromine, cyano, trifluoromethyl, trifluoromethoxy, (C1-C4) alkyl and (C1-C4) alkoxy, R4 is hydrogen or (C1-C4) alkyl, R5 is hydrogen, (C1-C4) alkyl, (C1-C4) alkylcarbonyl, (C3-C6) cycloalkyl or 4-6 membered heterocycloalkyl, wherein (i) said (C1-C4) alkyl is optionally substituted with hydroxy, (C1-C4) alkoxy, hydroxycarbonyl, alkoxycarbonyl ( C1-C4), aminocarbonyl, mono- (C1-C4) -alkyl-aminocarbonyl, di-alkylaminocarbonyl (C1-C4) or cycloalkyl (C3-C6), and (ii) said cycloalkyl (C3-C6) is optionally substituted with one or two substituents independently selected from the group consisting of (C1-C4) alkyl, hydroxy and amino, and (iii) said 4- to 6-membered heterocycloalkyl is optionally substituted with one or two substituents independently selected from the group consisting of alkyl ( C1-C4), hydroxy, oxo and amino, R6 is hydrogen, (C1-C4) alkyl, (C3-C6) cycloalkyl or 4-6 membered heterocycloalkyl, and where (i) said (C1-C4) alkyl is optionally substituted with hydroxy, (C1-C4) alkoxy,
