FIELD: chemistry.
SUBSTANCE: invention relates to a novel crystalline modification of para-methoxyanilide of 6-hydroxy-4-oxo-2,4-dihydro-1H-pyrrolo-[3,2,1-ij]quinoline-5-carboxylic acid of formula: 
(I) , which is obtained by crystallisation from ethyl acetate, where values of interplanar distance (d) and relative reflection intensities (Irel) are given in claim 1.
EFFECT: novel crystalline modification exhibits a high diuretic effect.
2 dwg, 9 tbl, 6 ex
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