2-hydroxy-4-[6-[2-(4-hydroxy-3-methoxyphenyl)ethenyl]-1,3,7,10-tetraoxo-6a,9-diphenyl-4,6,10a,11,11a,11b-hexahydro-3aH-naphtho[2,3-e]isoindol-2-yl]benzoic acid is the IUPAC name of a molecule. Please give its molecular formula.