17850
The key to the formation of Au cubic nanoframes is to coat the surfaces of the Au - Ag nanocages with sufficiently thick layers of Au before they are dealloyed .
 Chemical: Au; Chemical: Au - Ag; Chemical: Au
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: Au; Chemical: Au - Ag; Chemical: Au