24970
The drug system ( DOX / PEG - FA / SWNTs ) exhibits excellent stability under neutral pH conditions such as serum , but dramatically releases DOX at reduced pH typical of the tumour environment and intracellular lysosomes and endosomes .
 Chemical: DOX; Chemical: PEG; Chemical: DOX
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: DOX; Chemical: PEG; Chemical: DOX