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In this work , the electronic properties of l - diphenylalanine nanotubes ( FF - NTs ) have been studied using the Self - Consistent Charge Density - Functional - based Tight - Binding method augmented with dispersion interaction .
 Chemical: l - diphenylalanine
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: l - diphenylalanine