FIELD: chemistry.SUBSTANCE: invention refers to the compounds of formula (I): where R denotes cycloalkyl, heterocyclil, aryl, alkyl-O-C(O)-, alkanoyl or alkyl where each cycloalkyl, heterocyclil and aryl does not necessarily contain from 1 to 3 substitutes chosen from the group including alkyl, hydroxy group, halogen, cyano group, alkoxy group, alkyl-O-C(O)-, amino group, mono- or disubstituted by alkyl amino group and heterocyclil, and where each alkyl-O-C(O)-, alkyl, alkoxy group and heterocyclil does not necessarily have additional 1 to 3 substitutes chosen from the group including a hydroxy group, alkyl, halogen, carboxy group, alkoxy group, alkyl-O-C(O)-, alkanoyl, alkyl-SO2-, amino group, mono- or disubstituted by alkyl amino group and heterocyclil； R2 denotes alkyl, cycloalkyl, cycloalkylalkyl- or alkoxy group where alkyl does not necessarily contain from 1 to 3 substitutes chosen from the alkoxy group or halogen； R3 denotes R8-O-C(O)-, (R8)(R9)N-C(O)-, R8-C(O)-, where R8 and R9 independently denote alkyl, cycloalkyl, aryl, arylalkyl-, cycloalkylalkyl- or nonaromatic heterocyclil where each alkyl, cycloalkyl, aryl, arylalkyl-, cycloalkylalkyl- and nonaromatic heterocyclil do not necessarily contain from 1 to 3 substitutes chosen from the group including a hydroxy group, carboxy group, alkyl-O-C(O)-, alkyl-C(O)-O- and alkanoyl； R4 and R5 independently denote hydrogen, alkyl, alkynyl, alkoxy group, cycloalkyl, arylalkyl-, cycloalkylalkyl-, heteroarylalkyl-, monoalkylamino-C(O)-, dialkylcmino-C(O)- or dialkylamino-C(O)-alkyl-, where both these alkyl groups do not necessarily form a ring and where each alkyl, alkynyl, cycloalkyl, arylalkyl-, cycloalkylalkyl- heteroarylalkyl-, monoalkylamino-C(O)-, dialkylamino-C(O)- or dialkylamino-C(O)-alkyl- do not necessarily contain from 1 to 3 substitutes chosen from the group including alkyl, hydroxy group, halogen, carboxy group and alkoxy group； R6 and R7 independently denote hydrogen, halogenalkyl, halogen, dialkylamin
