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Level 3
N - Nervous systemN02 - AnalgesicsN02A - Opioids
N02AA - Natural opium alkaloidsN02AB - Phenylpiperidine derivativesN02AC - Diphenylpropylamine derivativesN02AD - Benzomorphan derivativesN02AE - Oripavine derivativesN02AF - Morphinan derivativesN02AG - Opioids in combination with antispasmodicsN02AX - Other opioids
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