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A separation by LC was achieved using a reversed - phase column and a water / acetonitrile mobile phase , both containing formic acid , using a gradient system and a temperature of 40 degrees C .
 Chemical: acetonitrile; Chemical: formic acid
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: acetonitrile; Chemical: formic acid