Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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205/00
Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom
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C07D205/02
not condensed with other rings
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C07D205/06
having one double bond between ring members or between a ring member and a non-ring member
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C07D205/08
with one oxygen atom directly attached in position 2, e.g. beta-lactams
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