A 1-deoxy-11-hydroxy-Δ8-THC dimethylheptyl analogue — a 'classical' dibenzopyran rather than an indole — from Huffman, Yu, Showalter et al., 'Synthesis and pharmacology of a very potent cannabinoid lacking a phenolic hydroxyl with high affinity for the CB2 receptor' (J. Med. Chem. 39:3875–3877, 1996). Showed the phenolic hydroxyl of THC is not required for receptor binding, and was one of the first CB2-preferring ligands.