You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-(trifluoromethyl)-7-[2-[2-(trifluoromethyl)phenyl]ethyl]-8,9-dihydro-6H-pyrido[4,3-b][1,8]naphthyridine .
user
C21H17F6N3
assistant