16018
For the met - enkephalin pentapeptide at a water - graphite interface , we were able to obtain accurate predictions for the location of the adsorbed peptide and its free energy of adsorption from around 50 and 80 SMD simulations , respectively .
 met - enkephalin, pentapeptide, graphite
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 met - enkephalin, pentapeptide, graphite