R-2 Parent Hydrides and their Derived Substituent Groups
R-2.4 Polycyclic Parent Hydrides
R-2.4.1 Fusion nomenclature
R-2.4.2 Bridged parent hydrides - extension of the von Baeyer system
R-2.4.3 Spiro parent hydrides
R-2.4.4 Ring assemblies
R-2.4.5 Cyclophanes
R-2.4.6 Natural product parent hydrides

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