23552
Although the hydrolyzed metabolites of prilocaine ( o - toluidine ) and lidocaine ( 2 , 6 - xylidine ) have been suspected to induce methemoglobinemia , the metabolic enzymes that are involved remain uncharacterized .
 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