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Interactions between bufadienolides derived from toad venom and verapamil in langendorff - perfused guinea - pig hearts .
 Chemical: bufadienolides; Chemical: verapamil
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: bufadienolides; Chemical: verapamil