operidine
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Phenoperidine — Systematic (IUPAC) name ethyl 1 (3 hydroxy 3 phenylpropyl) 4 phenylpiperidine 4 carboxylate Clinical data Pregnancy cat … Wikipedia
pethidine — noun A fast acting opioid analgesic drug used in the treatment of severe pain. Syn: isonipecaine, lidol, meperidine , USAN, operidine, pethanol, piridosal … Wiktionary