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Good separation of the mentioned compounds was achieved on a C18 stationary phase with a sodium azide and sodium heptane sulfonate solution , acetonitrile and water at ratio of 50 : 1 : 49 ( v / v / v ) .
 Chemical: sodium azide; Chemical: sodium heptane sulfonate; Chemical: acetonitrile
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: sodium azide; Chemical: sodium heptane sulfonate; Chemical: acetonitrile