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desmethylprodine
MPPP (1-methyl-4-phenyl-4-propionoxypiperidine, Desmethylprodine) is an opioid analgesic drug. It is not used in clinical practice, but has been illegally manufactured for recreational drug use. It is an analog of pethidine (Demerol), but since it is not used in medicine, the DEA has labeled it a Schedule I drug in the United States.