| abstract |
A compound of formula (I), or a pharmaceutically acceptable salt thereof ** (See formula) ** in which: R1 is H or -CH2OH; R2 is H, halogen, C1-4 alkyl, C1-4 fluoroalkyl or -C≡C-R3; R3 is H, C1-4 alkyl, C3-7 cycloalkyl, or phenyl, wherein phenyl is optionally substituted with one or more substituents independently selected from C1-4 alkyl, halogen, C1-4 alkoxy, and cyano; X is CH2, CHF, CF2, O, S, SO, SO2, NH, or NR4; and R4 is C1-4 alkyl. |