free spiro union 

https://doi.org/10.1351/goldbook.F02522
See: spiro union
Source:
Blue Book, p. 37 [Terms] [Book]
Citation: 'free spiro union' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.F02522 RIS BibTex EndNote
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