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Pharmaceutical and Healthcare Online Databases.
Over 100,000 approved drugs and health products.
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Level 3
N - Nervous System
N02 - Analgesics
N02A - Opioids
N02AA - Natural opium alkaloids
N02AB - Phenylpiperidine derivatives
N02AC - Diphenylpropylamine derivatives
N02AD - Benzomorphan derivatives
N02AE - Oripavine derivatives
N02AF - Morphinan derivatives
N02AG - Opioids in combination with antispasmodics
N02AX - Other opioids
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