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Among the seven studies that met our exclusion criteria , three used nicotinic acid as the therapeutic intervention and four used nicotinamide .
 Chemical: nicotinic acid; Chemical: nicotinamide
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: nicotinic acid; Chemical: nicotinamide