9951
The calculated results show that their optical and electronic properties are affected by the substituent groups in 4 - position of 1 , 8 - naphthalimide .
 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