Patent ID: 7799954

Claim:
A compound or pharmaceutically acceptable salt thereof having the formula (I) wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are independently a hydrogen atom or an alkyl, alkenyl, alkynyl, or aryl comprising 1 to 30 carbon atoms and which is unsubstituted or substituted by at least one of hydroxy, cyano, mercapto, halogen, —OR 7 , SR 7 , —NR 7 R 8 , —CONR 7 R 8 , or —OCONR 7 R 8 , wherein R 7 and R 8 are a hydrogen atom; an alkyl, alkenyl, or alkynyl comprising 1 to 20 carbon atoms; a cyclic or heterocyclic group comprising 5 or 6 ring atoms of which from 0 to 3 are nitrogen and/or oxygen and/or sulphur hetero-atoms, said cyclic or heterocyclic group being unsubstituted or substituted by at least one of hydroxy, cyano, mercapto, halogen, or an alkyl group comprising 1 to 6 carbon atoms; and X and Y are respectively O, NR 7 or S, wherein when X and Y are O, and if R 2 , R 4 are hydrogen, R 1 -R 3 or both R 1 -R 3 and R 5 -R 6 form a cyclic or an acyclic alkenyl; when X and Y are O, and if R 2 , R 4 form a single bond, R 1 is wherein Ar is an aryl or heteroaryl.