1176
Here , we used two compounds , Compound 44 [ 6 , 6 - dimethyl - 3 - ( 3 - hydroxypropyl ) thio - 1 - ( thiazol - 2 - yl ) - 6 , 7 - dihydro - 2 - benzothiophen - 4 ( 5H ) - one ] and Compound 6 [ methyl 3 , 5 - diphenylpyridazine - 4 - carboxylate ] , with functional activity as potentiators of gamma - aminobutyric acid at GABA ( A ) alpha 5 receptors , to test their ability to improve hippocampal - dependent memory in aged rats with identified cognitive impairment .
 Chemical: 6 , 6 - dimethyl - 3 - ( 3 - hydroxypropyl ) thio - 1 - ( thiazol - 2 - yl ) - 6 , 7 - dihydro - 2 - benzothiophen - 4 ( 5H ) - one; Chemical: methyl 3 , 5 - diphenylpyridazine - 4 - carboxylate; Chemical: gamma - aminobutyric acid; Chemical: GABA
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: 6 , 6 - dimethyl - 3 - ( 3 - hydroxypropyl ) thio - 1 - ( thiazol - 2 - yl ) - 6 , 7 - dihydro - 2 - benzothiophen - 4 ( 5H ) - one; Chemical: methyl 3 , 5 - diphenylpyridazine - 4 - carboxylate; Chemical: gamma - aminobutyric acid; Chemical: GABA