9947
Theoretical investigation into optical and electronic properties of 1 , 8 - naphthalimide derivatives .
 Chemical: 1 , 8 - naphthalimide
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: 1 , 8 - naphthalimide