(±)-CP 55,940 is a bicyclic mimetic of Δ The isomer (−)-CP 55,940, which structurally resembles the A and C ring of Δ (+)-CP 55,940 is an enantiomer purified from the (±)-CP 55,940 racemic mixture. The functional characteristics of this isomer have not been studied. However, there is no significant difference between the racemate and (−) isomer in analgesic activity in four of five tests, suggesting that (+)-CP 55,940 is biologically active.
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