24029
The mechanism of formation of benzene rings during the pyrolysis of dichloro - and trichloroethylene has been investigated by the method of Laser Powered Homogeneous Pyrolysis coupled with product analysis by gas chromatography .
 Chemical: benzene; Chemical: dichloro - and trichloroethylene
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: benzene; Chemical: dichloro - and trichloroethylene