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)

Sulfur containing hetero ring (e.g., thiiranes, etc.) (Class 549/1)

Oxygen containing hetero ring (e.g., dioxirane, etc.) (Class 549/200)

With preservative or stabilizer (Class 549/201)
Heavy metal or aluminum containing (Class 549/206)
Boron containing (Class 549/213)
Silicon containing (Class 549/214)
Phosphorus bonded directly to the hetero ring (Class 549/216)
Phosphorus attached indirectly to the hetero ring by nonionic bonding (Class 549/218)
Xanthene ring system having a benzene ring bonded directly thereto para to the xanthene ring oxygen, wherein the carbon of a -COO- group is bonded directly to the benzene ring ortho to its position of attachment to the xanthene ring system, and spirolactone derivatives thereof (e.g., fluoresceins, chlorofluorans, etc.) (Class 549/223)
The hetero ring contains -O-C(=X)-O- as part of its structure, wherein X is chalcogen (e.g., cyclic carbonates, etc.) (Class 549/228)
Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) (Class 549/231)
Lactones (i.e., -C(=X)O-, wherein X is chalcogen, is part of the hetero ring) (Class 549/263)
Spiro (Class 549/330)
The hetero ring has at least seven members (Class 549/346)
The hetero ring is six-membered (Class 549/356)
The hetero ring is five-membered (Class 549/429)
The hetero ring is four-membered (Class 549/510)
The hetero ring is three-membered consisting of one oxygen and two carbons (Class 549/512)

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