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Chemical structures of six cannabinoids: the phytocannabinoids (a) tetrahydrocannabinol (THC) and (b) cannabidiol (CBD); the synthetic cannabinoids (c) WIN55212-2 and (d) HU-210; and the endocannabinoids (e) 2-arachidonylgylcerol (2-AG) and (f) arachidonoyl ethanolamide (anandamide, AEA).
