Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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207/00
Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
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C07D207/02
with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
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C07D207/44
having three double bonds between ring members or between ring members and non-ring members
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C07D207/444
having two doubly-bound oxygen atoms directly attached in positions 2 and 5
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C07D207/448
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms, e.g. maleimide
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