Patent ID: 6989388

Claim:
A compound of formula I, wherein Y is a hetero atom selected from sulphur (S), or nitrogen (N), R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are the same or different, and each represent hydrogen, hydroxy, OR 7 , carboxy, COOR 7 , amino, NHR 7 or halogen, or R 5 and R 6 taken together form a fused non-aromatic 5- or 6-membered ring, R 7 is C 1 –C 6 alkyl, C 2 –C 6 alkenyl or C 3 –C 7 cycloalkyl optionally substituted with one or more group selected from hydroxy, C 1 –C 4 alkoxy, carboxy, C 1 –C 6 alkoxycarbonyl, amino, C 1 –C 6 mono- or di-alkylamino or halogen; or a salt, solvate, or physiologically equivalent derivative thereof.