26892
The effective material bases of toxicity alleviation to realgar ( As2S2 ) were Dahuang ( Rhei Radix et Rhizoma ) , Huangqin ( Scutellariae Radix ) , Jiegeng ( Platycodonis Radix ) and Gancao ( Glycyrrhizae Radix et Rhizoma ) , which regulated energy metabolism , choline metabolism , amino acid metabolism and gut flora disorder affected by realgar ( As2S2 ) exposure .
 realgar, As2S2, choline, amino acid, realgar, As2S2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 realgar, As2S2, choline, amino acid, realgar, As2S2