You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-[(4-methylbenzoyl)amino]-4-oxo-3-(4-propan-2-ylphenyl)thieno[3,4-d]pyridazine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H25N3O4S
assistant