FIELD: pharmacology.
SUBSTANCE: invention relates to a heterocyclic compound of the general formula (I) or an N-oxide thereof, wherein X1, X2, X3 and X4 independently represent CR4 or N, where 0 or 1 of X1-X4 can be N; Y1, Y2 and Y3 are hydrogen; R1 is selected from hydrogen, 
, C6 aryl, 6-member heterocycloalkyl containing 2 heteroatoms selected from N and O, and 5- or 6-member heteroaryl containing 1-4 heteroatoms selected from N, O and S, wherein each of C6 aryl, 6-member heterocycloalkyl and 5- or 6-member heteroaryl may be optionally substituted with one R4; R2 is selected from hydrogen, halogen, C1-6 alkyl, , C6 aryl and 6-member heteroaryl containing 1 to 2 N atoms, where each of C6 aryl and 6-member heteroaryl may be optionally substituted with one R4. If X5 is N, R2 is selected from halogen, C1-6 alkyl, 
, C6 aryl and 6-member heteroaryl containing 1 to 2 N atoms, where each of C6 aryl, and 6-member heteroaryl may be optionally substituted with one R4; each R4 Is independently selected from hydrogen, halogen, cyano, oxo, C1-6 alkoxy, -C(O)OR5, -C(O)R5, C1-6 alkyl. Moreover , C1-6 alkyl may be optionally substituted with 1 to 3 substituents selected from halogen and cyano; R5 is C1-6 alkyl; and where the central structure of Formula I, limited by X5, X6, X7 and X8, is:
or 
The invention also relates to particular compounds, a method for inhibiting the secretion of WNT signalling in a cell, use of a compound of formula (I), a method for treatment of a disorder mediated by WNT. 
.
EFFECT: new heterocyclic compounds have been obtained that are useful for treatment of cancer, fibrosis and osteoarthritis.
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