23560
o - Toluidine and 2 , 6 - xylidine were further metabolized by CYP2E1 to 4 - and 6 - hydroxy - o - toluidine and 4 - hydroxy - 2 , 6 - xylidine , respectively , and these metabolites were shown to more efficiently induce Met - Hb formation than the parent compounds .
 o - Toluidine, 2 , 6 - xylidine, 4 - and 6 - hydroxy - o - toluidine, 4 - hydroxy - 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:
 o - Toluidine, 2 , 6 - xylidine, 4 - and 6 - hydroxy - o - toluidine, 4 - hydroxy - 2 , 6 - xylidine