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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 systemG03D - Progestogens
 
 G03DA - Pregnen (4) derivativesG03DB - Pregnadien derivativesG03DC - Estren derivatives
 
 
 
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