Organic Compounds (class 532, Subclass 1)
Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen as the only ring hetero atoms (class 540, subclass 1)
- Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) (Class 548/100)
- Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) (Class 548/400)
- The hetero ring contains four members including nitrogen and carbon (Class 548/950)
- Hetero ring is three-membered including nitrogen and carbon (Class 548/954)
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