13094
Electron transfer dissociation ( ETD ) : the mass spectrometric breakthrough essential for O - GlcNAc protein site assignments - a study of the O - GlcNAcylated protein host cell factor C1 .
 Chemical: O - GlcNAc; Chemical: O
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: O - GlcNAc; Chemical: O