Databases for Chemists and Chemical Engineers

Chemical Abstracts

Family search retrieves substances which match the query exactly and any multi-component substances that contain the exact query as one of the components
- All positions in query are blocked for further substitution
- All query rings are isolated
- No variable nodes are allowed in the query
- Variable bond values are allowed in the query
- Retrieves all substances having the same connection table
  - Unsubstituted substance
  - Stereoisomers
  - Isotopically labelled substances
  - Radicals
  - Ions
  - Homopolymers
- Retrieves multi-component substances that have the query as one of the components
Family search may be used to find polymers of a specific monomer
Family search will add hydrogens to all vacant atoms on the substructure drawn
Family search will not permit any other non-hydrogen atoms to be present in the component corresponding to the substructure drawn. Any atoms may be present in other component(s).