18542
In fact , most of the 7 - acylamino derivatives showed low nanomolar affinity ( Ki = 2 . 5 - 45 nM ) and high selectivity toward this receptor .
 Chemical: 7 - acylamino
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: 7 - acylamino