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  1. Enter a Retention Index value and a Tolerance parameter
  2. Select the GC stationary phase from the pull-down menu (optional)
  3. Select the type of derivatization from the pull-down menu (optional)
  4. Enter the Average Mass and and a Tolerance level for the mass (optional)
  5. Enter any number of TMS and/or TBDMS derivatives (optional)
  6. You can optionally draw a structure in the white box on the left as a search query
  7. Click the "Search" button