8722
These conjugates are synthesized by coupling antibodies to maleimide - functionalized poly ( N - ( 2 - hydroxypropyl ) - methacrylamide ) ( poly - HPMA ) copolymers derived through reversible addition - fragmentation chain transfer ( RAFT ) polymerization of pentafluorophenyl methacrylate via the intermediate step of an activated ester polymer .
 maleimide, poly ( N - ( 2 - hydroxypropyl ) - methacrylamide ), poly - HPMA, pentafluorophenyl methacrylate, ester
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 maleimide, poly ( N - ( 2 - hydroxypropyl ) - methacrylamide ), poly - HPMA, pentafluorophenyl methacrylate, ester