30242
An important advance was recently reported by Gunaydin and Houk , suggesting that ions are involved in the mechanism and the process initiates by water autoionization followed by protonation of the ester ( WAIA mechanism ) .
 Chemical: ester
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: ester