Install gchempaint by entering the following commands in the terminal:
sudo apt update sudo apt install gchempaint
Description:
2D chemical structures editor for the GNOME2 desktop
GChemPaint is an editor for 2D chemical structures with a multiple document interface. Drawn molecules can be searched at NIST Webbook and PubChem.
Homepage: http://www.nongnu.org/gchemutils/
Version: 0.14.17-1ubuntu1
Section: universe/science