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)
- Six-membered hetero ring consists of oxygen, sulfur, nitrogen and carbon (e.g., oxathiazines, etc.) (Class 544/2)
- Six-membered hetero ring consists of sulfur, nitrogen, and carbon (Class 544/3)
- Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) (Class 544/63)
- Tetrazines (Class 544/179)
- Triazines (Class 544/180)
- The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) (Class 544/224)
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