8684
Blood samples were obtained at 0 and 6 hours postdose for the measurement of serum bupropion ( BU ) and hydroxybupropion ( HB ) concentrations .
 Chemical: bupropion; Chemical: hydroxybupropion
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: bupropion, hydroxybupropion 
Answer:
 Chemical: bupropion; Chemical: hydroxybupropion