Morpheridine

Morpheridine (Morpholinoethylnorpethidine) is a 4-phenylpiperidine derivative that is related to the opioid analgesic drug pethidine (meperidine). It is a strong analgesic with around 4 times the potency of pethidine, and unlike pethidine, does not cause convulsions, although it produces the standard opioid side effects such as sedation and respiratory depression.