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| Formula | C31H35N3O2 | 
| Molar mass | 481.640 g·mol−1 | 
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R-5260 is an opioid drug from the orphine series, which is a derivative of the opioid analgesic norpipanone, but with the piperidine ring fused with a spiro heterocycle. It was developed by Janssen Pharmaceutica, and is a highly potent opioid around 10x the potency of fentanyl. It is related to other potent opioid derivatives such as dipipanone, bezitramide, R-4066 and spirochlorphine, and is also related to dopamine antagonist neuroleptic drugs such as spiperone and fluspirilene, although R-5260 does not have any dopamine antagonist activity itself. [1] [2]