or a pharmaceutically acceptable salt or derivative thereof. The compound may be used in the treatment or prevention of a disorder selected from appetite regulation, obesity, metabolic disorders, cachexia, anorexia, pain, inflammation, neurotoxicity, neurotrauma, stroke, multiple sclerosis, spinal cord injury, Parkinsons disease, levodopa-induced dyskinesia, Huntingtons disease, Gilles de la Tourettes syndrome, tardive dyskinesia, dystonia, amyotrophic lateral sclerosis, Alzheimers disease, epilepsy, schizophrenia, anxiety, depression, insomnia, nausea, emesis, alcohol disorders, drug addictions such as opiates, nicotine, cocaine, alcohol and psychostimulants, hypertension, circulatory shock, myocardial reperfusion injury, atherosclerosis, asthma, glaucoma, retinopathy, cancer, inflammatory bowel disease, acute and chronic liver disease such as hepatitis and liver cirrhosis, arthritis and osteoporosis.