You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (3'-methanehydrazonoylspiro[2H-1-benzofuran-3,4'-piperidine]-1'-yl)-[5-(2-phenylethynyl)furan-2-yl]methanone is given. What is its corresponding molecular formula?
user
C26H23N3O3
assistant