Patent ID: 7030160

Claim:
A compound of formula (I): in which: R 1 and R 2 are independently a hydrogen atom, a benzyl group, a benzoyl group, a —CO(C 1 –C 4 )Alk group, a —CH 2 OCH 3 group, a —COO(C 1 –C 4 )Alk group or a benzyloxycarbonyl group; or R 1 and R 2 together form a carbonyl, methylene or di(C 1 –C 4 )Alk-methylene group so that R 1 and R 2 taken together with the oxygen and nitrogen atoms to which they are attached and the carbon atoms of the phenyl moiety to which the O and N atoms are attached form heterocyclyl; R 3 is a hydrogen atom or a (C 1 –C 4 )Alk group; R 4 is a hydroxyl group, a (C 1 –C 4 )alkoxy group or an —NR 5 R 6 group; R 5 and R 6 are independently a hydrogen atom; a (C 1 –C 4 )Alk group; an aryl or heteroaryl group, each of which is optionally substituted with an R 7 group; an aralkyl or heteroaralkyl group, each of which is optionally substituted with an R 7 group; or R 5 and R 6 taken together with the nitrogen atom to which they are attached form a saturated or unsaturated 5 to 7 atom cycle; R 7 is a hydrogen atom, a halogen atom, a hydroxyl group, a (C 1 –C 4 )Alk group, a (C 1 –C 4 )alkoxy group, a —COOH group, a —COO(C 1 –C 4 )Alk group, a —CN group, an —NH(C 1 –C 4 )Alk group or an —N(C 1 –C 4 )Alk 2 group; and X is O or CH 2 ; or a salt or solvate thereof.