20410
Tissue distribution , excretion , and mass balance of radioactivity were investigated in male CD - 1 mice , following a single intravenous administration of the [ ( 3 ) H ] - siRNAs , at a target dose level of 5 mg / kg .
 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