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Captopril ( 50 mg / kg / day , given orally ) , an inhibitor of angiotensin - converting enzyme used as a standard cardioprotective drug , was used as a positive control in this study .
 Chemical: Captopril; Chemical: angiotensin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Captopril; Chemical: angiotensin