The Chemistry Cartridge adds the SIMILAR operator to SQL. When applied to a SMILES-containing column, rows containing structures which are similar to a given structure are selected. The binary Tanimoto coefficient is used for similarity determination: a value of 1.0 means "identical", 0.0 means "completely dissimliar". The level of similarity to be required is user-adjustable. At high levels (~0.8 or more), this is a fast, robust search type. At low levels (~0.65 or less), the results are not meaningful and result in large answer sets. Other examples are also available.

Cc1noc(NS(=O)(=O)c2ccc(N)cc2)c1C

TO_CHAR(SYSDATE,'MM:
--------------------
10:21:1998, 12:47:25

Elapsed: 00:00:00.00
old   2: where Similar(smiles,'&1',&2,1)=1
new   2: where Similar(smiles,'Cc1noc(NS(=O)(=O)c2ccc(N)cc2)c1C',0.90,1)=1

     ID SMILES
------- ---------------------------------
 112391 Cc1noc(NS(=O)(=O)c2ccc(N)cc2)c1C

Elapsed: 00:00:00.99

TO_CHAR(SYSDATE,'MM:
--------------------
10:21:1998, 12:47:26