FIELD: chemistry.SUBSTANCE: invention relates to novel quinazolinone derivatives selected from the group of compounds indicated below or pharmaceutically acceptable salts thereof. Compounds possess the properties of an inhibitor of Tankyrase (TANK) and can be used to treat diseases selected from a group consisting of cancer of the head, neck, eye, mouth, throat, esophagus, bronchus, larynx, pharynx, chest, bone, lung, colon, rectum, stomach, prostate, urinary bladder, uterine, cervix, breast, ovaries, testicles or other reproductive organs, skin, thyroid, blood, lymph nodes, kidney, liver, pancreas, brain, central nervous system, solid tumors and malignant transformation of blood.No.Name"A1"6-fluoro-2-[4-(1-hydroxy-1-methylethyl)-phenyl]-3H-quinazolin-4-one"A2"2-[4-(1-hydroxy-1-methylethyl)-phenyl] -8-methoxy-3H-quinazolin-4-one"A3"8-fluoro-2-[4-(1-hydroxy-1-methylethyl)-phenyl]-3H-quinazolin-4-one"A4"5-fluoro-2- [4-(1-hydroxy-1-methylethyl)-phenyl]-3H-quinazolin-4-one"A5"6-chloro-2-[4-(1-hydroxy-1-methylethyl)-phenyl]-3H-quinazolin-4-one"A6"8-chloro-2-[4-(1-hydroxy-1-methylethyl)-phenyl]-3H-quinazolin-4-one"A7"6-fluoro-2-{4-[1- (2-hydroxyethoxy)-1-methylethyl]-phenyl}-3H-quinazolin-4-one"A11"6,8-difluoro-2-[4-(1-hydroxy-1-methylethyl)phenyl]-3H-quinazolin-4-one"A12"5,6-difluoro-2-[4- (1-hydroxy-1-methylethyl)phenyl]-3H-quinazolin-4-one"A13"6-fluoro-2-[5-(1-hydroxy-1-methylethyl)-2-pyridyl]-3H-quinazolin-4-one"A14"2-[4-(1-ethyl-1-hydroxypropyl)phenyl]-6-fluoro-3H-quinazolin-4-one"A16"6-fluoro-2-[4- (1-hydroxycyclopentyl)phenyl]-3H-quinazolin-4-one"A17"6-fluoro-2-[4-(3-hydroxyoxetan-3-yl)phenyl]-3H-quinazolin-4-one"A18"2-[4-[1-(2-aminoethoxy)-1-methylethyl]phenyl]-6-fluoro-3H-quinazolin-4-one"A19"6-fluoro-2-[4-(4-piperidyl)phenyl]-3H-quinazolin-4-one"A21"6-fluoro-2-{4-[1-(2-hydroxyethoxy)-1-methylethyl]-phenyl}-8-methyl-3H-quinazolin-4-one"A23"5-chloro-2-[4-(1-hydroxy-1-methylethyl)-phenyl]-3H-quinazolin-4-one"A24"2-[4-(1-hydroxy-1-methylethyl)-phenyl]-8-methyl-3H-qu
