Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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473/00
Heterocyclic compounds containing purine ring systems
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C07D473/26
with an oxygen, sulphur, or nitrogen atom directly attached in position 2 or 6, but not in both
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C07D473/34
attached in position 6, e.g. adenine
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