Compound of formula (I) ** Formula ** in which A represents -CH2- or -SO2-, R1 represents hydrogen, (C1-C6) alkyl, (C2-C6) alkenyl, (C2-C6) alkynyl or cycloalkyl (C3-C7), alkyl (C1-C6), alkenyl (C2-C6) and alkynyl (C2-C6) may be substituted with 1 to 3 substituents independently selected from the group of halogen, cyano, oxo, trifluoromethyl, cycloalkyl (C3-C7), phenyl, -OR10, -NR11R12, -C (>； = O) -OR13 and -C (>； = O) -NR14R15, in which cycloalkyl (C3-C7) can be substituted with 1 or 2 substituents independently selected from each other from the group of (C1-C4) alkyl, oxo, hydroxyl, alkoxy (C1-C4) and amino, and in which phenyl may be substituted with 1 to 3 substituents independently selected from each other from the halogen group, cyano, nitro, (C1-C4) alkyl, trifluoromethyl, hydroxyl, hydroxymethyl, (C1-C4) alkoxy, trifluoromethoxy, (C1-C4) alkoxymethyl, hydroxycarbonyl, (C1-C4) alkoxycarbonyl, aminocarbonyl, mono- alkyl (C1-15 C4 ) -aminocarbonyl and di-(C1-C4) alkyl-aminocarbonyl, and wherein R10, R11, R12, R13, R14 and R15 independently represent each other respectively hydrogen or (C1-C6) alkyl, in which (C1 -C6) on the other hand it can be substituted with 1 or 2 substituents independently selected from each other from the group of amino, hydroxy, (C1-C4) alkoxy, hydroxycarbonyl and (C1-C4) alkoxycarbonyl and may be substituted (C3- cycloalkyl) C7) with 1 or 2 substituents independently selected from the group of (C1-C4) alkyl, (C1-C4) alkoxy, hydroxyl, amino and oxo, R2 represents phenyl, phenyl may be substituted with 1 to 3 substituents independently selected from yes from the group of halogen, cyano, nitro, (C1-C4) alkyl, trifluoromethyl, hydroxyl, (C1-C4) alkoxy and trifluoromethoxy, R3 represents hydrogen or (C1-C4) alkoxy, R4 represents (C1-C6) alkyl - carbonyl, hydroxycarbonyl, (C1-C6) alkoxycarbonyl, mono (C1-C6) -aminocarbonyl or di-a (C1-C6) -aminocarbonyl alkyl, which may be substituted by (C1-C6) alkylcarbonyl, (C1-C6) alkoxycarbonyl, mon
