3539
The objective of this review is to summarize fundamentals , applications , and recent advances of injectable thermosensitive hydrogel as DDSs , including chitosan and related derivatives , poly ( N - isopropylacrylamide ) - based ( PNIPAAM ) copolymers , poly ( ethylene oxide ) / poly ( propylene oxide ) ( PEO / PPO ) copolymers and its derivatives , and poly ( ethylene glycol ) / biodegradable polyester copolymers .
 Chemical: poly ( N - isopropylacrylamide ); Chemical: PNIPAAM; Chemical: poly ( ethylene oxide ); Chemical: poly ( propylene oxide ); Chemical: PEO; Chemical: PPO; Chemical: poly ( ethylene glycol ); Chemical: polyester
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: poly ( N - isopropylacrylamide ); Chemical: PNIPAAM; Chemical: poly ( ethylene oxide ); Chemical: poly ( propylene oxide ); Chemical: PEO; Chemical: PPO; Chemical: poly ( ethylene glycol ); Chemical: polyester