14168
There are seemingly conflicting data in the literature regarding the role of serotonin ( 5 - HT ) 5 - HT2C receptors in the mouse head - twitch response ( HTR ) elicited by the hallucinogenic 5 - HT2A / 2B / 2C receptor agonist 2 , 5 - dimethoxy - 4 - iodoamphetamine ( DOI ) .
 Chemical: serotonin; Chemical: 5 - HT; Chemical: 2 , 5 - dimethoxy - 4 - iodoamphetamine; Chemical: DOI
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: serotonin; Chemical: 5 - HT; Chemical: 2 , 5 - dimethoxy - 4 - iodoamphetamine; Chemical: DOI