5214
A series of N - succinyl chitosan ( NSCS ) with different degree of succinylation ( DS ) and molecular weight were synthesized .
 Chemical: N - succinyl
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: N - succinyl