Compounds of formula (I) or a pharmaceutically acceptable salt thereof: wherein R1, R2and R3are various substituent groups; and one of X1and X2is N or CR′, and the other is NR′ or CHR′ wherein R′ is hydrogen, OH, C1-6alkyl, or C3-7cycloalkyl; or when one of X1and X2is N or CR′ then the other may be S or O; and their use as pharmaceuticals.
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(2008/06/13)
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