You can use the Ring Isolation on the QueryDef menu to define ring isolation as:
Isolated/Embedded: search for structures with the selected ring system either isolated or embedded in a ring system
Isolated: search for structures that have no additional ring fusion to the selected ring system. Additional substitution is allowed at nodes in the ring
Mixture: This is selected when multiple rings are selected with different ring isolation settings. Changing the ring isolation value changes all selected rings, regardless of previous settings.
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