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The third group received an additional injection of diltiazem the day before and first 2 days after the contrast injection .
 Chemical: diltiazem; Chemical: contrast
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: diltiazem; Chemical: contrast