20777
Despite the short half - life of ( 13 ) N ( 9 . 97 min ) , the accumulation of NPs in different organs could be measured during the first 68 min after administration .
 Chemical: ( 13 ) N
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: ( 13 ) N