You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 6-[(1E,3Z,6E)-3-hydroxy-7-(4-hydroxy-3-methoxyphenyl)-5-oxohepta-1,3,6-trienyl]-8-methoxy-2-oxochromene-4-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H22O9
assistant