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 1,3-diphenylbenzene;1,4-diphenylbenzene;2,6-diphenylpyrazine;3,5-diphenylpyridazine;2,4-diphenylpyridine;2,6-diphenylpyridine;2,4-diphenylpyrimidine;4,6-diphenylpyrimidine;ethane .
user
C210H250N10
assistant