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The use of peptide ( Cys - Ala - Leu - Asn - Asn ) as ligands to stabilize and functionalize gold nanoparticles provides technical and operational convenience .
 Chemical: Cys - Ala - Leu - Asn - Asn
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: Cys - Ala - Leu - Asn - Asn