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Compounds of the general formula shown above. They may be considered to be spiro compounds having bridges of carbon atoms connecting the α and α' positions.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1335 (https://doi.org/10.1351/pac199567081307)