7261
Furthermore , both the donor / acceptor substituted naphthalimide fluorophores 1 - 2 were exploited in sensing calf - thymus DNA via switch - on fluorescence response .
 Chemical: 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: naphthalimide