23556
In addition , Met - Hb formation when prilocaine and o - toluidine were incubated with HLM was higher than that when lidocaine and 2 , 6 - xylidine were incubated with HLM .
 prilocaine, o - toluidine, lidocaine, 2 , 6 - xylidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 prilocaine, o - toluidine, lidocaine, 2 , 6 - xylidine