FIELD: chemistry.
SUBSTANCE: invention relates to novel 4- or 5-aminosalicylic acid derivatives of formula (I) and a pharmaceutical composition based on said derivatives, meant for treating inflammatory bowel diseases, irritable bowel syndrome and for preventing/treating colon cancer: A-L-R (I), A denotes 
or 
, where -N=, -NH, -NH2 and -NH2 lie in position 4 or 5, respectively; L denotes O, O-C=O, S, N or a covalent bond; and R is part of a hydrogen sulphide freeing molecule.
EFFECT: obtaining novel biologically active substances.
21 cl, 29 ex, 24 dwg
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