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Official Gazette of the United States Patent & Trademark Office Patents 1263(3), Oct 15

Compounds of formula (I) or a pharmaceutically acceptable salt thereof: ##STR1## 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, C1-6 alkyl, or C3-7 cycloalkyl; or when one of X1 and X2 is N or CR' then the other may be S or O; and their use as pharmaceuticals.

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Accession: 035985980

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