3291
The third plasma radiometabolite was suggested to be a carboxylic acid compound that accounted for 15 % of the rat brain radioactivity .
 Chemical: carboxylic acid
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: carboxylic acid