> For the complete documentation index, see [llms.txt](https://chembl.gitbook.io/surechembl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chembl.gitbook.io/surechembl/chemical-search/structure-drawing.md).

# Structure drawing

SureChEMBL allows you to use EPAM's [Ketcher](https://lifescience.opensource.epam.com/ketcher/index.html) for chemical drawing.

Click on the "Structure Search" button to open Ketcher.

<figure><img src="/files/3BrlYo5tuhvdeagcfkko" alt=""><figcaption><p>The molecule sketcher is accessed clicking on the "Structure Search" button</p></figcaption></figure>

***Drawing the structure***

<figure><img src="/files/ihZI6uVT6mXVI2MdgH0n" alt=""><figcaption></figcaption></figure>

To draw a structure with Ketcher:&#x20;

* Click on the desired Drawing tool icon.\
  \&#xNAN;*The selected icon is highlighted*.
* Click in the drawing pane to place or use the item.&#x20;
* Repeat for all elements of the structure.&#x20;

&#x20;

***Connecting elements***

For the elements to properly combine into a coherent structure, you need to carefully select the location for the new element.

* Place the first piece of the structure in the drawing pane.
* Select the drawing tool for the next item to insert into the drawing.
* Point at the exact location where the new element connects to the existing drawing.\
  \&#xNAN;*A visual indicator appears at the exact location on the existing structure where the new item will connect.*
* Click.&#x20;

***Note*****:** *To select amongst a single, double, or triple bond, point to the middle of the bond to modify and click through the bond types until the desired one displays.*

***Deleting elements***

To remove the last element inserted, click on the **Undo** icon.

***Deleting the complete structure***

If you are still in the drawing application and realise you do not want to keep the structure you were drawing, click the **Clear** button in the upper right corner.

***More information***

See Ketcher [User's Guide](https://lifescience.opensource.epam.com/ketcher/index.html).


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