22899
In the present study , a chemical derivatization of isomeric hydroxylated metabolites with 2 - fluoro - N - methyl pyridinium p - toluenesulfonate was found to confer distinct theoretical CCS value on each isomer by forming corresponding N - methyl pyridine ( NMP ) derivative .
 Chemical: 2 - fluoro - N - methyl pyridinium p - toluenesulfonate; Chemical: N - methyl pyridine; Chemical: NMP
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: 2 - fluoro - N - methyl pyridinium p - toluenesulfonate; Chemical: N - methyl pyridine; Chemical: NMP