30290
Enzyme - responsive surface erosion of poly ( ethylene carbonate ) for controlled drug release .
 Chemical: poly ( ethylene carbonate )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: poly ( ethylene carbonate ) 
Answer:
 Chemical: poly ( ethylene carbonate )