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 Level 2
 
 C - Cardiovascular systemC09 - Agents acting on the renin-angiotensin system
 
 C09A - ACE inhibitors, plainC09B - ACE inhibitors, combinationsC09C - Angiotensin II antagonists, plainC09D - Angiotensin II antagonists, combinationsC09X - Other agents acting on the renin-angiotensin system
 
 
 
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