Examples of "Get Substances Not Completed"
When a structure question is too general and SciFinder can not complete a structure search with the supplied information, the "Get Substances Not Complete" is displayed.
Click on Additional Options and get these options:
- Including additional components
- Including substance types
- Limiting by formula weight
Include substances with additional components is checked by default. Substances such as salts, mixtures, and copolymers are considered multi-component substances and will be retrieved by default.
If you wish to limit the type of substances you retrieve to those that have only the component that you have drawn as the structure question you may deselect this option.
Include the following substance classes is also checked by default. It will allow you to specify classes of substances you desire in your search results.
To search the entire CAS REGISTRYSM file, retain both of these default selections.
To reduce the number of retrievals, deselect one of more of the substance classes.
A third option, limit by formula weight, is also available. This option is most useful for single-component organic structure queries. Multiple-component answers will be retrieved if at least one component matches the structure query AND falls in the formula weight range.
To limit by formula weight:
- Enter a maximum value in the Max box. This will limit the substances your structure question will run against.
Tip: If you are concerned about capturing every answer near the minimum formula weight, reduce the prefilled MIN value by a few atomic weight units. This expands the search to include any ionized (deprotonated) species or substances where a ring closure has eliminated pairs of H atoms, as these will have slightly lower formula weight than your query as drawn.
Rounding: Decimal values are rounded up for maximums and down for minimums, to the nearest integer.
Example: A formula weight entered as Min 128.4 and Max 132.6 will return substances with weights calculated between 128 and 133.
Updated 4/20/2007 4:43:47 PM
