Cannabidiol, molecular model. Cannabidiol (CBD) is a cannabinoid chemical found in cannabis plants. Cannabis-derived drugs may be medically useful due to their ability to relieve pain and nausea, increase appetite and control muscle spasms. They may be beneficial to patients with multiple sclerosis, AIDS, cancer and chronic pain from nerve damage. The molecular formula for CBD is: C21.H30.O2. Atoms (spheres) are colour-coded: carbon (light grey), hydrogen (white), and oxygen (red).