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The large - conductance , Ca ( 2 + ) - dependent potassium ( BK ) channel blocker , iberiotoxin , attenuated CHPG actions .
 Chemical: Ca ( 2 + ); Chemical: potassium; Chemical: CHPG
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: Ca ( 2 + ); Chemical: potassium; Chemical: CHPG