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All the biological data collected and reported herein allowed us to rationalize the structure - activity relationship of the 4 - imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - DHPs and to identify which of these enhanced the activity at the central level .
 Chemical: 4 - imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - DHPs
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: 4 - imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - DHPs