You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-methyl-2-[4-[(7-methyl-2-oxochromen-4-yl)methyl]piperazin-1-yl]-N-phenylacetamide by IUPAC nomenclature, provide its molecular formula.
user
C24H27N3O3
assistant