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 benzene;benzylbenzene;1,1'-biphenyl;biphenylene;9,9-diphenylfluorene;ethane;naphthalene;prop-1-yne;prop-1-ynylbenzene;toluene .
user
C203H246
assistant