7876
For the first injection , values for MRT , T1 / 2 , Cmax , and AUC for PEG - 5K - Hu BChE and PEG - 20K - Hu BChE were similar to those for Hu BChE .
 PEG, PEG
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PEG, PEG