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Manfred R osner ( Eppstein/Taunus, DE )
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No Company infomation exists
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Manfred R osner ( Eppstein/Taunus, DE )
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Compounds of the formula I ##STR1## and tautomeric forms thereof, of the formula Ia, ##STR2## in which the substituents R1-R4 and X and Y have the meanings given; have an antiviral activity.
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