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ChemOffice.Com - CambridgeSoft

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Searching for Intermediates<br />

Rarely, you may be looking for reactions for which<br />

you only know something about an intermediate.<br />

An Intermediate Search is very similar to a normal<br />

reaction search, except that there are arrows on<br />

both sides of the target structure. For example,<br />

consider the query:<br />

R C C O<br />

This finds any reactions containing the Ketene<br />

structure shown as an intermediate.<br />

NOTE: ChemFinder cannot predict products or<br />

intermediates of reactions. It finds this information only if it<br />

is already present in the database.<br />

<strong>Com</strong>bined Searches<br />

You can combine structure searching with text<br />

searching to find a specific class of compounds. For<br />

example, you may want to find all compounds in<br />

the database whose names end in mycin and whose<br />

structures contain a phenyl ring. Because you are<br />

entering multiple queries in different data boxes,<br />

there is an implicit AND condition between data<br />

items in different fields.<br />

To perform a combined search:<br />

1. From the Search menu, choose Enter Query<br />

to clear the form.<br />

2. Enter the structural query, if any.<br />

3. Enter the text and/or numeric queries in the<br />

appropriate boxes.<br />

4. From the Search menu, choose Find.<br />

An example of combined searching:<br />

Suppose you want to find all molecules in the<br />

CS_Demo database that contain a benzene ring and<br />

which have names related to penicillin.<br />

1. From the Search menu, choose Enter Query<br />

to clear the form.<br />

2. Draw a benzene ring.<br />

3. Enter *penicillin* in the Molname field.<br />

4. With the Substructure option selected, choose<br />

Find from the Search menu.<br />

You get 2 hits of molecules whose names contain<br />

penicillin and whose structures have an aromatic<br />

ring of six carbon atoms.<br />

NOTE: In a combined search, progress reports are given<br />

only during the structure search part. When the counters at<br />

the bottom of the screen are advancing, structures are being<br />

searched. You can press Esc to end a search during the<br />

structure searching. You cannot end a search during the SQL<br />

searching by pressing Esc.<br />

SQL Searches<br />

SQL (Structured Query Language) can be used to<br />

create powerful searches. The details of the<br />

language are not discussed here.<br />

Queries beginning with a backslash (\) are taken as<br />

straight SQL, and passed directly to the database as<br />

the WHERE clause of the SQL query. These must<br />

contain column names and punctuation as dictated<br />

by SQL. For example, a valid query might be<br />

\[molname] like 'benz*' and [bpoint] > 200.<br />

A straight SQL query may be entered in any box of<br />

the form which contains non-structural data. The<br />

SQL query is not associated with the box in which<br />

it is entered.<br />

Searching Procedures<br />

ChemFinder<br />

Searching includes the following steps:<br />

<strong>ChemOffice</strong> 2005/ChemFinder Searching • 325<br />

<strong>Com</strong>bined Searches

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