15432
Further , a homology model of human M ( 5 ) receptor based on the crystal structure of the rat M ( 3 ) receptor was constructed , and docking studies of compounds 28 and 56 were performed in an attempt to understand the possible binding mode of these novel analogues to the receptor .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None