16765
In a previous study of non - peptide , guanide - based CXCR4 - binding compounds , spermine and spermidine phenylguanides inhibited HIV - 1 entry at low micromolar concentrations .
 Chemical: guanide; Chemical: spermine and spermidine phenylguanides
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: guanide; Chemical: spermine and spermidine phenylguanides