Patent ID: 7067536

Claim:
A compound of formula 1 wherein R 1 (i) is —C 1-10 -alkyl, straight-chain or branched-chain, optionally mono- or polysubstituted by mono-, bi- or tricyclic saturated or mono- or polyunsaturated carbocycles with 3–14 ring members, wherein the carbocyclic substituents in turn are substituted one or more times by —NO 2 and may optionally be substituted one or more times by —C 1-6 -alkyl, —OH, —NH 2 , —NHC 1-6 -alkyl, —N(C 1-6 -alkyl) 2 , —NO 2 , —CN, —F, —Cl, —Br, —I, —O—C 1-6 -alkyl, —S—C 1-6 -alkyl, —SO 3 H, —SO 2 C 1-6 -alkyl, —OSO 2 C 1-6 -alkyl, —COOH, —(CO)C 1-5 -alkyl, —COO—C 1-5 -alkyl or/and —O(CO)C 1-5 -alkyl, and wherein the alkyl groups on the carbocyclic substituents in turn may optionally be substituted one or more times by —OH, —SH, —NH 2 , —F, —Cl, —Br, —I, —SO 3 H or/and —COOH, R 2 is hydrogen or —C 1-3 -alkyl, R 3 , R 4 and R 5 are hydrogen or a hydroxyl group, wherein at least one of these substituents must be a hydroxyl group, R 6 and R 7 may be identical or different and are hydrogen, —C 1-6 -alkyl, —OH, —SH, —NH 2 , —NHC 1-6 -alkyl, —N(C 1-6 -alkyl) 2 , —NO 2 , —CN, —SO 3 H, —SO 3 —C 1-6 -alkyl, —COOH, —COO—C 1-6 -alkyl, —O(CO)—C 1-5 -alkyl, —F, —Cl, —Br, —I, —O—C 1-6 -alkyl, —S—C 1-6 -alkyl, -phenyl or -pyridyl, wherein the phenyl or pyridyl substituents in turn may optionally be substituted one or more times by —C 1-3 -alkyl, —OH, —SH, —NH 2 , —NHC 1-3 -alkyl, —N(C 1-3 -alkyl) 2 , —NO 2 , —CN, —SO 3 H, —SO 3 C 1-3 -alkyl, —COOH, —COOC 1-3 -alkyl, —F, —Cl, —Br, —I, —O—C 1-3 -alkyl, —S—C 1-3 -alkyl, or/and —O(CO)C 1-3 -alkyl, and wherein the alkyl substituents in turn may optionally be substituted one or more times by —OH, —SH, —NH 2 , —F, —Cl, —Br, —I, —SO 3 H, —SO 3 C 1-3 -alkyl, —COOH, —COOC 1-3 -alkyl, —O—C 1-3 -alkyl, —S—C 1-3 -alkyl or/and —O(CO)—C 1-3 -alkyl, or a salt of the compounds of formula 1.