17414
Chemical modifications based on the crystal structure of 2 - ( phosphonoethoxy ) ethylguanine ( PEEG ) in complex with human HGPRT have led to the design of new ANPs .
 Chemical: 2 - ( phosphonoethoxy ) ethylguanine; Chemical: PEEG; Chemical: ANPs
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: 2 - ( phosphonoethoxy ) ethylguanine; Chemical: PEEG; Chemical: ANPs