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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C07D473/02
with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6
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C07D473/06
with radicals containing only hydrogen and carbon atoms, attached in position 1 or 3
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C07D473/12
with methyl radicals in positions 1, 3, and 7, e.g. caffeine
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