Antiviral purine derivatives with improved gastrointestinal absorption
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United States of America Patent
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Oct 12, 1993
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May 21, 1992
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Aug 17, 1989
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Abstract
Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein R.sub.1 is hydrogen or hydroxy; and R.sub.2 is C.sub.1-6 alkyl; which are pro-drugs for 9-(3-hydroxyprop-1-oxy)guanine having antiviral activity, a process for their preparation and their use as pharmaceuticals.
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