24264
Self - diffusion coefficient measurements were performed for pure n - alkyl ketone liquids using the pulsed field gradient NMR spin - echo technique .
 Chemical: n - alkyl ketone
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: n - alkyl ketone 
Answer:
 Chemical: n - alkyl ketone