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A historically defined class centered on carbon frameworks and their derivatives, with conventional exclusions such as many carbon oxides, carbonates, and carbides.
source: Constitutes / realizes; target: Constituted / realized by
Authored annotation
forms a recurring reactive substructure
Authored explanation
A functional group is a structural component used to organize recurring reactivity in organic compounds, while the molecular environment modifies its electronic and steric behavior.
How to interpret this relation type
The source is a material constituent, structural component, or underlying quantum field whose excitation realizes the target physical system or particle. The edge label and detail must distinguish composition from field excitation; neither implies a simple classical sum of parts.
Carbonyl compounds form a broad organic compound class united by a carbonyl functional group but divided into distinct subclasses by the groups attached to its carbon.
How to interpret this relation type
The target is a member or subtype of the broader source class.