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Structure - activity relationship of 5 - chloro - 2 - methyl - 3 - ( 1 , 2 , 3 , 6 - tetrahydropyridin - 4 - yl ) - 1H - indole analogues as 5 - HT6 receptor agonists .
 Chemical: 5 - chloro - 2 - methyl - 3 - ( 1 , 2 , 3 , 6 - tetrahydropyridin - 4 - yl ) - 1H - indole
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 5 - chloro - 2 - methyl - 3 - ( 1 , 2 , 3 , 6 - tetrahydropyridin - 4 - yl ) - 1H - indole