24013
Ionically cross - linked multilayers ~ 120 nm thick were fabricated layer - by - layer on the surfaces of balloon - mounted stainless steel stents using plasmid DNA and a hydrolytically degradable poly ( beta - amino ester ) ( polymer 1 ) .
 Chemical: poly ( beta - amino ester )
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 ( beta - amino ester )