Patent ID: 7541360

Claim:
A compound of formula I, stereoisomeric and tautomeric forms and mixtures thereof, and physiologically tolerated salts, and esters thereof: wherein: R 1 is chosen from hydrogen, R 2 is chosen from, independently of R 1 , hydrogen, (C 1 -C 20 )-alkyl, and cycloalkylalkyl, R 4 is chosen from phenyl, (C 1 -C 20 )-alkylphenyl, and (C 2 -C 20 )-alkyl, which is optionally substituted with —OH, alkyloxy or halogen, R 11 is chosen from (C 1 -C 5 )-alkyl, which is optionally substituted, R 12 and R 13 are independently chosen from hydrogen, and (C 1 -C 5 )-alkyl, which is optionally substituted.