Patent ID: 6951875

Claim:
A compound of formula wherein one of R 1 and R 2 is —(CH 2 ) n NR 5 R 5′ and the other of R 1 and R 2 is selected from the group hydrogen, alkyl, —(CH 2 ) n NR 5 R 5′ and —(CH 2 ) n+1 OH; R 5 and R 5′ are each independently hydrogen; R 3 and R 4 are each independently selected from the group hydrogen, lower alkyl lower alkoxy, halogen, trifluoromethyl and hydroxy; Ar is selected from the group phenyl and thiophenyl; n is 0; or a pharmaceutically acceptable acid addition salt thereof, with the proviso that when Ar is unsubstituted phenyl and one of R 1 and R 2 is H, the other is not 2-amino or 5-amino and with the exception of 3-amino-2-[4-hydroxystyryl]pyridine and 3 -amino-2-styryl-6-pyridinylamine.