19630
The gas - phase reaction of methane sulfonic acid with the hydroxyl radical without and with water vapor .
 Chemical: methane sulfonic acid; Chemical: hydroxyl
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: methane sulfonic acid; Chemical: hydroxyl