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 Level 4
 
 C - Cardiovascular systemC02 - AntihypertensivesC02A - Antiadrenergic agents, centrally actingC02AA - Rauwolfia Alkaloids
 
 C02AA01 - RescinnamineC02AA02 - ReserpineC02AA03 - Combinations of Rauwolfia AlkaloidsC02AA04 - Rauwolfia Alkaloids, whole rootC02AA05 - DeserpidineC02AA06 - MethoserpidineC02AA07 - BietaserpineC02AA52 - Reserpine, combinationsC02AA53 - Combinations of Rauwolfia Alkoloids, combinationsC02AA57 - Bietaserpine, combinations
 
 
 
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