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Ligand Based Approach to L - Type Calcium Channel by Imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - Dihydropyridines : from Heart Activity to Brain Affinity .
 Chemical: Calcium; Chemical: Imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - Dihydropyridines
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: Calcium; Chemical: Imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - Dihydropyridines