21500
The best fit Langmuir - Hinshelwood parameters on average are K ( OH ) = 3 . 81 x 10 ( - 10 ) cm ( 3 ) molecule ( - 1 ) and k ( s ) = 9 . 71 x 10 ( - 17 ) cm ( 2 ) molecule ( - 1 ) s ( - 1 ) for all of the investigated organic compounds .
 Chemical: OH
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: OH