21495
Heterogeneous OH oxidation of biomass burning organic aerosol surrogate compounds : assessment of volatilisation products and the role of OH concentration on the reactive uptake kinetics .
 Chemical: OH; 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; Chemical: OH