Coumarin derivatives, process for their production and use thereof

A compound represented by the formula [I]:

• wherein R1 and R2 are each a hydrogen atom, a halogen atom, an optionally substituted linear hydrocarbon group, or a hydroxyl group which may be substituted with an optionally substituted linear hydrocarbon group, or R1 and R2 may be taken together with the adjacent carbon atoms to form an optionally substituted cyclic hydrocarbon, or a dihydrofuran ring which may be substituted with an oxo group;
• ring A is an optionally further substituted benzene ring;
• B is an optionally substituted aromatic ring;
• X is a bond or a spacer whose main chain consists of 1 to 6 atoms;
• Y is an optionally esterified carboxyl group, an optionally substituted carbamoyl group, a cyano group, or an optionally substituted heterocyclic group bearing a hydrogen atom capable of being deprotonated;
• provided that 3-[3-[7-chloro-3-(2-[[4-chloro-2-(trifluoromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propionic acid, ethyl 3-[3-[7-chloro-3-(2-[[4-chloro-2-(trifluoromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propionate, methyl (2E)-3-[3-[7-chloro-3-(2-[[4-chloro-2-(trifluoromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propenoate, (2E)-3-[3-[7-chloro-3-(2-[[4-chloro-2-(trifluoromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propenoic acid, ethyl (2E)-3-[3-[7-chloro-3-(2-[[4-chloro-2-(trifluoromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propenoate, ethyl (2E)-3-[3-[7-chloro-3-(2-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propenoate and (2E)-3-[3-[7-chloro-3-(2-[[4-fluoro-2-(trifluromethyl)phenyl]amino]-2-oxoethyl)-6-methyl-2-oxo-2H-chromen-4-yl]phenyl]-2-propenoic acid are excluded, or a salt thereof.