You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(2-butoxy-5-methylsulfonylphenyl)-3-ethyl-1-(pyridin-2-ylmethyl)-6H-pyrazolo[4,3-d]pyrimidin-7-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H27N5O4S
assistant