Patent ID: 6838479

Claim:
A Compound of formula (I) wherein X is 0; R 1 is H, —OR 7 , an amino acid or —NR 7 R 7′ wherein R 7 and R 7′ are independently H or a hydrocarbon chain, a carbocycle, a heterocycle, a carbocycle-substituted hydrocarbon chain or a heterocyle-substituted hydrocarbon chain optionally substituted with hydroxyl, halogen, cyano, amino, nitro, amidine, guanidine alkyl, halo-substituted alkyl, alkoxy, aryl or carboxyl; or R 7 and R 7′ together form a heterocyle optionally fused to another heterocycle or carbocycle wherein said heterocycle and carbocycle are optionally substituted with hydroxyl, halogen, amino, nitro, amidine, guanidine, alkyl, halo-substituted alkyl, alkoxy or carboxyl; R 2 is H or a hydrocarbon chain, a carbocycle or a carbocycle-substituted hydrocarbon chain optionally substituted with hydroxyl, oxo, halogen, cyano, amino, nitro, amidine, guanidine, alkyl, halo-substituted alkyl, alkoxy or carboxyl; and wherein said hydrocarbon chain is optionally interrupted with N, O, S, SO or SO 2 ; R 3 is H or a protecting group; R 4 is H; R 5 is H or R 4 and R 6 together form a 5 or 6 member carbocycle or heterocycle ring optionally substituted with hydroxyl, halogen, amino, nitro, amidine, guanidine or acylamino; n is 1; and salts, solvates and hydrates thereof.