1 Agents affecting nervous system and sensory organs
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2 Agents affecting individual organs
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3 Agents affecting metabolism
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4 Agents affecting cellular function
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5 Crude drugs and Chinese medicine formulations
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6 Agents against pathologic organisms and parasites
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7 Agents not mainly for therapeutic purpose
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8 Narcotics
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81 Alkaloidal narcotics
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82 Non-alkaloidal narcotics
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821 Synthetic narcotics
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8211 Phenylpiperazines
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D01383 Meperidine hydrochloride (USP); Pethidine hydrochloride (JP18)
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8219 Others
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829 Miscellaneous
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89 Other narcotics
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