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In the present work , we studied the pharmacokinetics of this short therapeutic hexapeptide ( His - ( D - Trp ) - Ala - Trp - ( D - Phe ) - Lys - NH ( 2 , ) MW = 872 . 44 Da ) in nine male healthy volunteers after a single intravenous bolus administration of 100 , 200 and 400 mu g / kg of body weight .
 Chemical: His - ( D - Trp ) - Ala - Trp - ( D - Phe ) - Lys - NH ( 2 , )
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: His - ( D - Trp ) - Ala - Trp - ( D - Phe ) - Lys - NH ( 2 , )