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)
- Heavy metal or aluminum containing (Class 546/2)
- Boron containing (Class 546/13)
- Silicon containing (Class 546/14)
- Spiro (Class 546/15)
- Phosphorus attached directly to the six-membered hetero ring by nonionic bonding (Class 546/21)
- Phosphorus attached indirectly to the six-membered hetero ring by nonionic bonding (Class 546/22)
- Polycyclo ring system having the six-membered hetero ring as one of the cyclos (Class 546/26)
- Piperidines (Class 546/184)
- Process of forming partially hydrogenated pyridine ring (Class 546/249)
- Process of forming pyridine ring (Class 546/250)
- Plural pyridine or partially hydrogenated pyridine rings (Class 546/255)
- Additional hetero ring containing (Class 546/268.1)
- Polycyclo-carbocyclic ring system having at least three cyclos (Class 546/285)
- Cyano bonded directly to the six-membered hetero ring (Class 546/286)
- Chalcogen bonded directly to ring carbon of the six-membered hetero ring (Class 546/290)
- Nitrogen attached directly to the six-membered hetero ring by nonionic bonding (Class 546/304)
- Thiocarbonyl bonded directly to the six-membered hetero ring (Class 546/313)
- Carbonyl bonded directly to the six-membered hetero ring (Class 546/314)
- Nitrogen attached indirectly to the six-membered hetero ring by nonionic bonding (Class 546/329)
- Chalcogen attached indirectly to the six-membered hetero ring by nonionic bonding (e.g., sulfato betaines, etc.) (Class 546/339)
- Halogen attached directly to the six-membered hetero ring by nonionic bonding (Class 546/345)
- Halogen attached indirectly to the six-membered hetero ring by nonionic bonding (Class 546/346)
- The ring nitrogen of the six-membered hetero ring is pentavalent (e.g., quaternary pyridinium salts, etc.) (Class 546/347)
- Unsubstituted or hydrocarbyl substituted only, or salt thereof (Class 546/348)
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