Patent ID: 7125428

Claim:
A 1,3-Dihydroxy-4-heteroarylbenzene derivative of formula (I), or a physiologically tolerated, water-soluble salt thereof: wherein X denotes oxygen, sulfur or N—R5; R1 and R2 are equal or different and, independently of each other, denote hydrogen, a halogen atom, a hydroxyl group, a C 1 –C 4 -alkoxy group, a C 1 –C 4 -hydroxyalkoxy group, a C 1 –C 6 -alkyl group, a C 1 –C 4 -alkylthioether group, a trifluoromethyl group, a —Si(CH 3 ) 3 group, a C 1 –C 4 -hydroxyalkyl group or a C 2 –C 4 -dihydroxyalkyl group; R3 and R4 are equal or different and, independently of each other, denote hydrogen, a hydroxyl group, a halogen atom, a cyano group, a C 1 –C 4 -alkoxy group, a C 1 –C 6 -alkyl group, a C 1 –C 4 -alkylthioether group, a mercapto group, a nitro group, an amino group, a C 1 –C 4 -alkylamino group, a di(C 1 –C 4 )alkylamino group, a —C(O)H group, a —C(O)CH 3 group, a —C(O)CF 3 group, a —Si(CH 3 ) 3 group, a C 1 –C 4 -hydroxyalkyl group or a C 2 –C 4 -dihydroxyalkyl group; and R5 denotes hydrogen, a C 1 –C 6 -alkyl group, a C 2 –C 4 -hydroxyalkyl group, a phenyl group or an acetyl group; with the proviso that at least one of R1 to R4 is not hydrogen when X denotes oxygen.