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Level 4
N - Nervous systemN02 - AnalgesicsN02A - OpioidsN02AB - Phenylpiperidine derivatives
N02AB01 - KetobemidoneN02AB02 - PethidineN02AB03 - FentanylN02AB52 - Pethidine, combinations excluding psycholepticsN02AB72 - Pethidine, combinations with psycholeptics
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