26332
Twelve alkyl analogues ( 1 - 12 ) of the high - affinity serotonin transporter ( SERT ) inhibitor 6 - nitroquipazine ( 6 - NQ ) were synthesized and studied using in vitro radioligand competition binding assays to determine their binding affinity ( Ki ) .
 Chemical: alkyl; Chemical: serotonin; Chemical: 6 - nitroquipazine; Chemical: 6 - NQ
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: alkyl, serotonin, 6 - nitroquipazine, 6 - NQ 
Answer:
 Chemical: alkyl; Chemical: serotonin; Chemical: 6 - nitroquipazine; Chemical: 6 - NQ