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Synthesis and evaluation of the naphthylguanide compounds identified our best compound , spermine tris - 1 - naphthylguanide , which bound CXCR4 with an IC ( 50 ) of 40 nM and inhibited the infection of TZM - bl cells with X4 , but not R5 , strains of HIV - 1 with an IC ( 50 ) of 50 - 100 nM .
 Chemical: naphthylguanide; Chemical: spermine tris - 1 - naphthylguanide
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: spermine tris - 1 - naphthylguanide