Moodle 2.7+ filter which converts text between [%   %] to easychem chemical
structures and formulas.  It utilizes easychem.js which was written
by Peter Win - (www.easychem.org ).

Note: This filter was designed to be used with the Easychem
Atto Editor (moodle-atto_easychem).  You should install it after
this for best results.

1) Download the zip file from my git hub site.
   https://github.com/cleblond/moodle-filter_easychem/archive/master.zip
2) Extract, rename the folder to easychem and place in your Moodle's /filter folder.
3) Proceed to the notifications section of the admin panel.
4) Confirm installation of moodle-filter_easychem
5) Proceed to Site administration > Plugins > filters > manage filters and activate the filter.