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Class Information
Number: 549/245
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) > The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) > Polycyclo ring system having the cyclic anhydride as one of the cyclos > Bicyclo ring system having the cyclic anhydride as one of the cyclos > Having -c(=x)-, wherein x is chalcogen, bonded directly to the bicyclo ring system > The -c(=x)- is part of a -c(=x)xh group, wherein the x's are the same or diverse chalcogens, or salt thereof (e.g., trimellitic anhydride, etc.)
Description: Compounds in which the -- is part of a --XH group, wherein the X"s are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium or tellurium); and wherein H of -XH may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal.
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