15455
As a first step , we describe molecular modeling to guide focused chemical syntheses of conjugates having nucleoside ( d4T ) and nonnucleoside ( TIBO ) moieties tethered by a flexible polyethylene glycol ( PEG ) linker .
 Chemical: nucleoside; Chemical: d4T; Chemical: TIBO; Chemical: polyethylene glycol; Chemical: PEG
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: nucleoside; Chemical: d4T; Chemical: TIBO; Chemical: polyethylene glycol; Chemical: PEG