21496
The reactive uptake coefficients ( gamma ) of OH by levoglucosan , abietic acid , and nitroguaiacol serving as surrogate compounds for biomass burning aerosol have been determined employing a chemical ionisation mass spectrometer coupled to a rotating - wall flow - tube reactor over a wide range of [ OH ] ~ 10 ( 7 ) - 10 ( 11 ) molecule cm ( - 3 ) .
 Chemical: OH; Chemical: levoglucosan; Chemical: abietic acid; Chemical: nitroguaiacol; 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: levoglucosan; Chemical: abietic acid; Chemical: nitroguaiacol; Chemical: OH