7888
To compensate for reduced cell uptake caused by the hydrophilic shell of polyplex , the integrin - binding peptide , RGD , was conjugated to the hydrophilic chain end of P ( OEGMA ) ( 15 ) - b - P ( GMA - TEPA ) ( 50 ) copolymer by Michael - type addition reaction .
 Chemical: P ( OEGMA ) ( 15 ) - b - P ( GMA - TEPA ) ( 50 )
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: P ( OEGMA ) ( 15 ) - b - P ( GMA - TEPA ) ( 50 )