16875
Fluorescence spectroscopy of PTCDA molecules on the KCl ( 100 ) surface in the limit of low coverages : site selection and diffusion .
 Chemical: PTCDA; Chemical: KCl
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: PTCDA; Chemical: KCl