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42.2 - (Alternate to A-41.3) - Rule A-41.3 applies also with appropriate different enumeration, where nomenclature is according to Rule A-42.1, but the spiro junction has priority for lowest numbers over unsaturation.
42.3 - (Alternate to A-41.5) - The nomenclature of Rule A-41.5 is applied also to monocyclic components with identical saturation, the spiro union being numbered 1.
42.4 - (Alternate to A-41.6 and A-41.7) - Polycyclic compounds containing more than one spiro atom are named in accordance with Rule A-42.1) starting from the senior end-component irrespective of whether the components are simple or fused rings.
See Recommendations'93 R-2.4.3
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