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We discovered these 7 - membered cyclic amide derivatives by introducing a distinctive linker through pharmacophore analysis of known ligands included in X - ray co - crystal structures .
 Chemical: 7 - membered cyclic amide
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 - membered cyclic amide