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https://www.uspto.gov/web/patents/classification/cpc/html/cpc-C07D.html
CPC Scheme - C07D HETEROCYCLIC COMPOUNDS
cpc
scheme
heterocyclic
compounds
https://www.uspto.gov/web/patents/classification/cpc/html/defC07D.html
CPC Definition - C07D HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
heterocyclic compounds
cpc
definition