You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,4-dihydroxyphenyl)-2-(4-methoxyphenyl)ethanone;4-hydroxy-3-(3-methylbut-2-enyl)naphthalene-1,2-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H28O7
assistant