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Because they are both cannabinoids, THC and CBD have exact similar chemical structure. Each molecule of CBD and THC has 2 oxygen atoms, 30 hydrogen atoms, and 21 carbon atoms. However, it’s Robert S Cahn, a British chemist, who is often credited for discovering the first cannabinoid – cannabidiol , which was isolated a couple of years later by US chemist Roger Adams. William B. O’Shaughnessy started investigating the therapeutic properties of CBD-rich cannabis.