Compounds of formula (I) or a pharmaceutically acceptable salt thereof: wherein R1, R2 and R3 are various substituent groups; and one of X1 and X2 is N or CR', and the other is NR' or CHR' wherein R' is hydrogen, OH, C1-6alkyl, or C3-7cycloalkyl; or when one of X1 and X2 is N or CR' then the other may be S or O; and their use as pharmaceuticals.
公式(I)的化合物或其药学上可接受的盐:其中R1、R2和R3是各种取代基;X1和X2中的一个是N或CR',另一个是NR'或CHR',其中R'是
氢、OH、C1-6烷基或C3-7
环烷基;或者当X1和X2中的一个是N或CR'时,另一个可以是S或O;以及它们作为药物的用途。