The present invention relates to a compound of Formula (I):wherein: n is 0 or 1 X is 0 or CH2 R1 is H or C1-2 alkyl R2 is H or C1-3 alkyl R3 and R4 are each independently H or C1-2 alkyl, where the alkyl may be substituted with one to three of the same or different substituents selected from R10 R5 is H or OCH3 R10 is F or Cl or a pharmaceutically acceptable salt or ester thereof