You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 2-[3-[2-[4-(2,3-dimethylphenyl)piperazin-1-yl]ethyl]-5-methoxyindol-1-yl]acetate by IUPAC nomenclature, provide its molecular formula.
user
C27H35N3O3
assistant