FIELD: chemistry.SUBSTANCE: invention relates to 2,3-substituted pyrazine sulphonamides of formula (I), use thereof in treating allergic diseases, inflammatory dermatosis, immonological disorders and neurodegenerative disorders, as well as pharmaceutical compositions, having CRTH2 receptor inhibiting action and inhibiting chemoattractant receptor, homologous to the molecule expressed on T-helpers 2. in general formula .A is selected from a group consisting of, n denotes an integer independently selected from 0, 1, 2, 3 or 4； m equals 1 or 2； B is selected from a group consisting of phenyl or piperazinyl； R1 denotes hydrogen； R2 denotes phenyl, where R2 is optionally substituted with one or more substitutes selected from a group consisting of halogen, cyano, (C1-C6)alkyl； R3 is selected from a group consisting of (C1-C6)alkyl, aryl, heteroaryl, (C1-C6)alkylaryl, (C1-C6)alkylheteroaryl, (C3-C8)cycloalkyl and (C3-C8)heterocycloalkyl, where each of said (C1-C6)alkyl, aryl, heteroaryl, (C1-C6)alkylaryl, (C1-C6)alkylheteroaryl, (C3-C8)cycloalkyl and (C3-C8)heterocycloalkyl is optionally substituted with one or more substitutes selected from a group consisting of halogen, cyano, (C1-C6)alkyl, (C1-C6)alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl, or where said aryl, heteroaryl, (C1-C6)alkylaryl, (C1-C6)alkylheteroaryl, (C3-C8)cycloalkyl or (C3-C8)heterocycloalkyl can be condensed with one or more aryl, heteroaryl, (C3-C8)cycloalkyl or (C3-C8)heterocycloalkyl groups and can be substituted with one or more substitutes selected from a group consisting of (C1-C6)alkyl, alkoxy, aryl, heteroaryl, carboxyl, cyano, halogen, hydroxy, amino, aminocarbonyl, nitro, sulphoxy, sulphonyl, sulphonamide and trihaloalkyl； R7 is selected from a group consisting of hydrogen, (C1-C6)alkyl, (C2-C6)alkenyl, (C2-C6)alkynyl, aryl, heteroaryl, (C3-C8)cycloalkyl, (C3-C8)heterocycloalkyl, carboxyl, cyano, amino and hydroxy； aryl is selected from phenyl or naphthyl； and heteroaryl is selected from
