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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 3
 
 L - Antineoplastic and immunomodulating agentsL01 - Antineoplastic agentsL01A - Alkylating agents
 
 L01AA - Nitrogen mustard analoguesL01AB - Alkyl sulfonatesL01AC - Ethylene iminesL01AD - NitrosoureasL01AG - EpoxidesL01AX - Other alkylating agents
 
 
 
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