You don’t have to install any programs, Java applets developed
by Anatoli Krassavin - the author of the ChemSymphony - will do
the job. There are two of them: Prepare Query Here, and Submit.
Please allow some time for these applets to load when you click
on the following links.

To search the WWW Chemicals Catalog by drawing structures
on-line click here. If you have your structure file in any format,
click here to search by pasting structure files. Enjoy your search!

You can also perform structure search the NCI database of 3D
chemical structures by drawing structures on-line, or by pasting
structure files.

If you want to search the WWW Chemicals Catalog by a chemical
name but are not sure if it is correct, click here to use structure
drawing for naming chemicals.