You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-hydroxy-4-[(Z)-4-hydroxy-3-methylbut-2-enoxy]phenyl]-5-(4-hydroxyphenyl)-3,6-dimethoxyphenol is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H26O7
assistant