| 主权项 |
1. A compound of formula I wherein R1 is aryl or heteroaryl, which are optionally substituted by one, two or three substituents, selected from lower alkyl, halogen, lower alkyl substituted by halogen, hydroxyl, lower alkoxy, lower alkoxy substituted by halogen, cyano or nitro; R2 is halogen, lower alkyl or cyano; R3 is hydrogen or lower alkyl; R4 is hydrogen or lower alkyl; R5, R6 are independently hydrogen or lower alkyl, or R5 and R6 together with the N-atom to which they are attached form a heterocycloalkyl ring; or a pharmaceutically acceptable acid addition salt, a racemic mixture or its corresponding enantiomer and/or optical isomers thereof. |
