You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-methyl-2-[4-[3-[4-[4-(trifluoromethyl)phenyl]phenyl]but-2-enoxy]phenoxy]butanoic acid ?
user
C28H27F3O4
assistant