8413
After 4 and 24 h , the highest concentration of DRF - 4012 was found in tumour indicating its retention in tumour site for a longer time .
 Chemical: DRF - 4012
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: DRF - 4012