10629
Reactions of thiol and maleimide PEG macromers in an off - stoichiometric Michael addition were performed , such that the maleimide moiety was in excess , to create hydrogel networks with pendant Diels - Alder compatible tethering sites , that is , the maleimide .
 Chemical: thiol; Chemical: maleimide PEG; Chemical: maleimide; Chemical: maleimide
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: thiol; Chemical: maleimide PEG; Chemical: maleimide; Chemical: maleimide