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This communication describes the synthesis and inhibitory activities of thirty - seven novel C - terminal agmatine dipeptides used as screening compounds to study the structure - activity relationship between active - site peptidomimetics and the West Nile virus ( WNV ) NS2B / NS3 serine protease .
 Chemical: C; Chemical: agmatine dipeptides; Chemical: serine
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: C; Chemical: agmatine dipeptides; Chemical: serine