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A highly effective drug carrier is constructed by coating folic acid - terminated poly ( ethylene glycol ) ( PEG - FA ) on single walled carbon nanotubes ( SWNTs ) in a facile non - covalent method .
 Chemical: folic acid; Chemical: poly ( ethylene glycol ); Chemical: PEG; Chemical: carbon
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: folic acid; Chemical: poly ( ethylene glycol ); Chemical: PEG; Chemical: carbon