Thomas and co-workers [277] reported that irradiation of (382) with a 450 W high-pressure mercury lamp brought about photocyclisation to a constrained analogue (394). The structure of the product was elucidated through NMR and X-ray diffraction analysis. The compound retained high affinity for the CBi receptor (Ki — 48 nM) and good selectivity over the CB2 receptor (Ki — 3,340 nM).

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