21873
The resulting diblock polymers consisted of one block with triethylene glycol brushes and another block with carboxylic acid groups to bind doxorubicin and Fe3O4 MNs .
 Chemical: triethylene glycol; Chemical: carboxylic acid; Chemical: doxorubicin; Chemical: Fe3O4
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: triethylene glycol; Chemical: carboxylic acid; Chemical: doxorubicin; Chemical: Fe3O4