15088
The highly selective sensors , built from very small modified DNA oligomers containing the unnatural fluorescent base pyrene , and employing thymine as a quencher , were found to function in a variety of complex biological media .
 Chemical: pyrene; Chemical: thymine
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: pyrene; Chemical: thymine