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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
D - DermatologicalsD03 - Preparations for treatment of wounds and ulcersD03B - EnzymesD03BA - Proteolytic enzymes
D03BA01 - TrypsinD03BA02 - ClostridiopeptidaseD03BA03 - CollagenaseD03BA52 - Collagenase, combinations
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