FIELD: chemistry.
SUBSTANCE: invention relates to organic chemistry, namely, to a crystalline formof {[1-cyano-5-(4-chlorophenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid (Compound A), characterized by having an X-ray powder diffractogram comprising at least one peak selected from 8.1, 10.6, 11.5, 14.5, 16.2, 19.3, 21.5, 21.9, 22.7, 24.5 and 26.6 °2θ ± 0.2 °2θ, determined on a diffractogram using Cu-Καradiation, as well as to a pharmaceutical composition comprising said form, method for treating a condition associated with hypoxia inducible factor (HIF), method for treating a condition associated with erythropoietin (EPO), method of treating anemia, a method for preparing the crystalline form of Compound A. 
Compound A.
EFFECT: obtained is a novel crystalline form of compound A, which is characterized by thermodynamic stability, which provides a number of advantages in manufacturing and preparing formulations therewith.
15 cl, 12 dwg, 2 tbl, 9 ex
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