9342
Thiol compounts such as N - acetyl - L - cysteine ( NAC ) , carbocysteine , erdosteine , and fudosteine have been extensively studied .
 Thiol, N - acetyl - L - cysteine, NAC, carbocysteine, erdosteine, fudosteine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Thiol, N - acetyl - L - cysteine, NAC, carbocysteine, erdosteine, fudosteine