主权项 |
1. A compound of the formulawherein:
A is selected from the group consisting of: Q is independently selected from halo, alkyl, hydroxy, amino and substituted amino; n is 0, 1, 2, 3, 4 or 5; R1, R3 and R4 are independently C, CH, CH2, O, N, NH or S, and R2 is C, CH, CH2, N, NH, C—CF3, CH—CF3 or C═O, or a stereoisomer or pharmaceutically acceptable salt thereof, wherein when n is 1, Q cannot be hydroxy. |