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Subsequently , crystal structures of CXCR4 were used to dock a series of naphthylguanide derivatives of the polyamines spermidine and spermine .
 Chemical: naphthylguanide; Chemical: polyamines; Chemical: spermidine; Chemical: spermine
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: naphthylguanide; Chemical: polyamines; Chemical: spermidine; Chemical: spermine