15430
Compound 56 , the most selective compound in this series , possesses an 11 - fold selectivity for the M ( 5 ) over M ( 1 ) receptor and shows little activity at M ( 2 ) - M ( 4 ) .
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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:
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