Patent ID: 6930130

Claim:
A compound of the formula (I): wherein R 1 , R 2 , R 3 , and R 4 are, independently of one another, alkyl residues with 1 to 6 carbon atoms; or a physiologically tolerated salt thereof, or an ester, ether, complex, or adduct thereof, or a stereoisomeric form of: a compound of formula (I) as described above, or a physiologically tolerated salt of a compound of formula (I) as described above, or an ester, ether, complex, or adduct of a compound of formula (I) as described above or a tautomeric form of: a compound of formula (I) as described above, or a physiologically tolerated salt of a compound of formula (I) as described above, or an ester, ether, complex, or adduct of a compound of formula (I) as described above.