Patent ID: 7691861

Claim:
A compound of formula I wherein R a is H or C 1-4 -alkyl; one of R b , R c , R d and R c is halogen, C 1-4 -alkoxy, or C 1-4 -alkyl, and the other three substituents are H; or R b , R c , R d and R e are all H; and R is a radical of formula (a) wherein R 1 is —(CH 2 ) n —NR 3 R 4 , wherein each of R 3 and R 4 , independently, is H or C 1-4 -alkyl; n is 1 or 2; and R 2 is H, halogen, C 1-4 -alkyl, or NO 2 ; or a salt thereof.