ChemDoodle is a chemical graphics library produced by iChemLabs. This page uses the ChemDoodle Web Components to produce the 2D sketcher on this page that can be used to draw simple organic molecules. This software is licensed under the open-source GPL license.
The green circle in the upper-right corner of the drawing window is a link to the ChemDoodle help page, which provides details on how to use this software. If desired, the size of the drawing area can be changed by dragging the right or bottom edges or the bottom-right corner.