12350
Further QM / MM calculations on the alternative water attack predict a concerted mechanism for this reaction , where the deprotonation of water , nucleophilic attack , and epoxide ring - opening take place via the same transition state .
 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: epoxide