You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(5-phenyl-1H-pyrazol-4-yl)methyl]-2-sulfanylidene-1,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H17N5OS
assistant