Perhaps you should try some spelling variations:
"bridges macrocyclic compounds, heterocyclic / economics" » "bridges heterocyclic compounds, heterocyclic / economics", "bonded macrocyclic compounds, heterocyclic / economics", "cages macrocyclic compounds, heterocyclic / economics", "ring macrocyclic compounds, heterocyclic / economics"
"bridges bicyclo compounds, heterocyclic / economics" » "bridges cyclic compounds, heterocyclic / economics", "bridged bicyclo compounds, heterocyclic / economics", "bridges bicyclic compounds, heterocyclic / economics", "bridged bicyclic compounds, heterocyclic / economics"

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