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The purpose of this paper is to study the potential of N - succinyl chitosan as a novel permeation enhancer for the intranasal absorption of isosorbide dinitrate ( ISDN ) .
 Chemical: N - succinyl; Chemical: isosorbide dinitrate; Chemical: ISDN
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; Chemical: isosorbide dinitrate; Chemical: ISDN