主权项 |
1. A compound of the following formula:wherein X is C, O, or NR2; R1 is independent and selected from hydrogen, alkyl, C3-10 cycloalkyl, aryl, benzyl, heteroaryl, halogen, CN, CF3, CO, CO-alkyl; R2 is selected from hydrogen, alkyl, C3-10 cycloalkyl, aryl, benzyl, heteroaryl, halogen, CN, CF3, CO, CO-alkyl; or a pharmaceutically acceptable salt thereof. |