768
Using a MOS - Hypersil reversed - phase column with a phosphate buffer - - acetonitrile mobile phase , baseline separation of antipyrine , its metabolites 3 - hydroxymethylantipyrine , norantipyrine and 4 - hydroxyantipyrine , and the internal standard , phenacetin , was achieved within 6 min .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None