6415
We report here on investigations into the mechanism of action of tetra - substituted naphthalene diimide ligands on the basis of cell biologic data together with a National Cancer Institute COMPARE study .
 Chemical: naphthalene diimide
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: naphthalene diimide