You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-butan-2-yl-3-tert-butyl-8-ethyl-4,7-dimethyl-2,3,4,4a,5,6,8,8a-octahydro-1H-naphthalene;propane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H50
assistant