7896
Acid - degradable cationic poly ( ketal amidoamine ) for enhanced RNA interference in vitro and in vivo .
 Chemical: poly ( ketal amidoamine )
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 ( ketal amidoamine )