20551
Abacavir - derived Edman adducts with the N - terminal valine of hemoglobin were analyzed by an established liquid chromatography - electrospray ionization - tandem mass spectrometry method .
 Chemical: Abacavir; Chemical: N; Chemical: valine
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: Abacavir, N, valine 
Answer:
 Chemical: Abacavir; Chemical: N; Chemical: valine