You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(4-hydroxy-3,6-dimethoxy-2-methyl-9H-carbazol-1-yl)methyl]-3-methoxy-1,2-dimethyl-9H-carbazol-4-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H30N2O5
assistant