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Spartan Molecular Database - Search by Structure
  To search the SMD by structure (the default searching option), a fragment is constructed using Spartan's builders.  As an example, the molecule indole (with attachments designated at the 2, 3, and 6 positions) has been used to substructure search the SMD for T1 Heat of Formation data.  Clicking on open valences places an orange graphical marker over the valence, designating it as and “attachment point” and the corresponding search will find all entries with any fragment attachments at these points (including hydrogens).