You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(3-bromo-4-hydroxy-5-methoxyphenyl)-8-methyl-3a,4,6,11,11a,11b-hexahydronaphtho[6,7-e]isoindole-1,3,7,10-tetrone is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H20BrNO6
assistant