11282
The gamma - CD - OEI - SS - FA polymer was well - characterized and studied in terms of its gene delivery properties in FR - positive KB cells and FR - negative A549 cells under various conditions , in comparison with cationic polymers such as high molecular weight branched polyethylenimine ( PEI ) , gamma - CD - OEI star - shaped cationic polymer , gamma - CD - OEI - FA polymer where FA was directed linked to the star polymer without disulfide linker .
 Chemical: gamma - CD - OEI - SS - FA; Chemical: polyethylenimine; Chemical: PEI; Chemical: gamma - CD - OEI; Chemical: gamma - CD - OEI - FA; Chemical: disulfide
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: gamma - CD - OEI - SS - FA; Chemical: polyethylenimine; Chemical: PEI; Chemical: gamma - CD - OEI; Chemical: gamma - CD - OEI - FA; Chemical: disulfide