8881
Described is the synthesis of 5 - hydroxytryptamine - tetramethylrhodamine ( 5HT * ) ; an indole nitrogen linked fluorescent conjugate of serotonin .
 Chemical: 5 - hydroxytryptamine - tetramethylrhodamine; Chemical: 5HT; Chemical: indole nitrogen; Chemical: serotonin
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: 5 - hydroxytryptamine - tetramethylrhodamine; Chemical: 5HT; Chemical: indole nitrogen; Chemical: serotonin