1996
A widely used chemotherapeutic agent , 5 - fluorouracil ( 5 - FU ) , readily crosses the blood - brain barrier and so could have a direct effect on brain function .
 Chemical: 5 - fluorouracil; Chemical: 5 - FU
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: 5 - fluorouracil; Chemical: 5 - FU