10287
A new copolymer , beta - poly ( N - 2 - hydroxyethyl ) - graft - { N - 2 - ethylene [ 2 - poly ( methacrylic acid sodium salt ) isobutyrate ] } - d , l - aspartamide ( PHEA - IB - p ( MANa ( + ) ) ) , was designed for the oral administration of sCT through the formation of supramolecular aggregates ( SAs ) based on electrostatic interactions .
 beta - poly ( N - 2 - hydroxyethyl ) - graft - { N - 2 - ethylene [ 2 - poly ( methacrylic acid sodium salt ) isobutyrate ] } - d , l - aspartamide, PHEA - IB - p ( MANa ( + ) )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 beta - poly ( N - 2 - hydroxyethyl ) - graft - { N - 2 - ethylene [ 2 - poly ( methacrylic acid sodium salt ) isobutyrate ] } - d , l - aspartamide, PHEA - IB - p ( MANa ( + ) )