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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
G - Genito urinary system and sex hormonesG03 - Sex hormones and modulators of the genital systemG03X - Other sex hormones and modulators of the genital systemG03XA - Antigonadotropins and similar agents
G03XA01 - DanazolG03XA02 - Gestrinone
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