14884
Both dendrimer - and PEG - Ara - C conjugates were 4 - fold more effective in inhibition of A549 cells compared to free Ara - C after 72 h of treatment .
 PEG, Ara - C, Ara - C
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PEG, Ara - C, Ara - C