20409
Absorption , distribution , metabolism , and excretion properties of two unformulated model siRNAs were determined using a single internal [ ( 3 ) H ] - radiolabeling procedure , where the full - length oligonucleotides were radiolabeled by Br / ( 3 ) H - exchange .
 Chemical: ( 3 ) H; Chemical: Br; Chemical: ( 3 ) H
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: ( 3 ) H; Chemical: Br; Chemical: ( 3 ) H