Patent ID: 8691850

Claim:
A compound of formula (I) in which R 1 represents hydrogen or represents (C 1 -C 6 )-alkyl which may be substituted by hydroxyl, amino, or mono- or di-(C 1 -C 4 )-alkylamino, R 2 represents (C 2 -C 6 )-alkyl which is mono- or disubstituted by identical or different substituents selected from the group consisting of hydroxyl, (C 1 -C 4 )-alkoxy, amino, mono- and di-(C 1 -C 4 )-alkylamino, R 3 represents a substituent selected from the group consisting of halogen, cyano, nitro, (C 1 -C 6 )-alkyl, hydroxyl, (C 1 -C 6 )-alkoxy, amino, mono- and di-( C 1 -C 6 )-alkylamino, carboxyl and (C 1 -C 6 )-alkoxycarbonyl, where alkyl and alkoxy for their part may in each case be substituted up to five times by fluorine, and n represents the number 0, 1, 2, 3, 4 or 5, where, if the substituent R 3 is present more than once, its meanings may be identical or different, or a salt, thereof.