You can insert plain SQL query here in order to search in pbch1m table (having columns: mol, name, formula, molweight), e.g.
SELECT mol, name FROM pbch1m WHERE 'S1C=CC2=C1C=CC=C2' |<| mol;
|<| Substructure search and Fullfragment search
Substructure search:
... WHERE query_structure |<| structure_column_name
... WHERE 'CCC' |<| mol
Fullfragment search:
... WHERE query_transform(query_structure, 'fullfragment') |<| structure_column_name
... WHERE query_transform('CCC', 'fullfragment') |<| mol
|=| Duplicate search
|>| Superstructure search
Similarity search:
... WHERE row (query_structure, similarity_value)::sim_order operator structure_column_name LIMIT n;
... WHERE row ('CCC', 0.8)::sim_order |<~| mol LIMIT 20;