FIELD: chemistry.
SUBSTANCE: description is given of a derivative of carboxylic acid with general formula 
, where R1 represents a hydrogen atom, C1-4alkyl, benzyl, E represents C(=O)-, -SO2- or -CH2-;R2 represents a halogen atom, C1-6 alkyl, C1-6 alkoxy, hydroxyl, C1-4 alkyl, substituted -OR8 , R3 represents a halogen atom, C1-6 alkyl, C1-6 alkoxy; R4 represents a hydrogen atom, C1-6alkyl; R5 represents C1-6 alkyl, C1-10 alkoxy, R8 represents C1-4 alkyl, phenyl; 
represents a benzol ring; G represents (1) C1-6 alkylene; 
represents dihydrobenzoxazine; m and n represent 0 or an integer from 1 to 4; I represents 0 or an integer from 1 to 8, where, when m is more or equal to 2, R2 is the same or different; when n is more or equal to 2, R3 is the same of different; when i is more or equal to 2, R5 is the same of different, or its pharmaceutical salt. Since the compound with formula (I), is linked to the DP receptor and has antagonistic effect to the DP receptor.
EFFECT: it is useful for preventing and/or curing such diseases as allergic rhinitis, allergic conjunctivitis, bronchial asthma, malt cell disease, migraine, contact dermatitis, stroke, ulcerative colitis, thrombocyte aggregration or sleep disorder.
