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| Formula | C18H17Cl2F3N4O2 | 
| Molar mass | 449.26 g·mol−1 | 
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GW-842,166X is a drug which acts as a potent and selective cannabinoid CB2 receptor agonist, with a novel chemical structure based on a pyrimidine core. It has potent analgesic, anti-inflammatory and anti-hyperalgesic actions in animal models, but without cannabis-like behavioural effects due to its extremely low affinity for the CB1 receptor. [1] [2] GSK brought this compound for into 4 clinical trials, two of them related to pain management [3] [4] and the other two related to bio-distributions. [5] [6] The trials were either withdrawn or completed without posting result.