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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 3
 
 G - Genito urinary system and sex hormonesG03 - Sex hormones and modulators of the genital systemG03B - Androgens
 
 G03BA - 3-Oxoandrosten (4) derivativesG03BB - 5-Androstanon (3) derivatives
 
 
 
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