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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
N - Nervous systemN02 - AnalgesicsN02A - OpioidsN02AX - Other opioids
N02AX01 - TilidineN02AX02 - TramadolN02AX03 - DezocineN02AX05 - MeptazinolN02AX06 - TapentadolN02AX52 - Tramadol, combinations
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