12347
According to quantum mechanics / molecular mechanics ( QM / MM ) calculations on the full solvated protein , the enzyme - catalyzed glutathione addition reaction involves two major chemical steps that both proceed in the sextet state : proton transfer from the GSH thiol group to the Tyr39 anion and nucleophilic attack by the GSH thiolate leading to epoxide ring - opening .
 Chemical: glutathione; Chemical: GSH thiol; Chemical: Tyr39; Chemical: GSH thiolate; Chemical: epoxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: glutathione; Chemical: GSH thiol; Chemical: Tyr39; Chemical: GSH thiolate; Chemical: epoxide