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Class Information
Number: 549/231
Name: Organic compounds -- part of the class 532-570 series > 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) > Oxygen containing hetero ring (e.g., dioxirane, etc.) > Cyclic anhydrides (i.e., -c(=x)oc(=x)-, wherein the x's are the same or diverse chalcogens, is part of the hetero ring)
Description: Compounds wherein the hetero ring is a cyclic anhydride; i.e., --O- is part of the ring, X"s are the same or different chalcogens (i.e., oxygen, sulfur, selenium or tellurium).
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