You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (2,4-dimethoxyphenyl)-[4-[6-(furan-2-yl)pyridazin-3-yl]piperazin-1-yl]methanone ?
user
C21H22N4O4
assistant