Heterocyclic compounds
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
Aug 21, 1991
filing date -
Aug 31, 1990
priority date (Note) -
Expired
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Abstract
Compounds of the formulae ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, X.sup.1 and Y.sup.1 have the stated meanings, processes for their preparation and their use.
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