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 2,9-dimethyldecane;2,9-dimethyldec-5-ene;2,6-dimethylheptane;2,8-dimethylnonane;methane;propane;yttrium .
user
C144H332Y8-16
assistant