Here's another good model of our favorite molecule.
http://www.3dchem.com/3dmolecule.asp?ID=16.
It's interactive.
Funny there are only 3 different elements in THC, hydrogen, oxygen, and carbon.
C21 (in black) H30 (in white) O2 (in red).
Theres a benzene ring at the base of the molecule C6H6, and the carbons branch from there terminated by hydrogen atoms.