You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-benzylidene-3-phenyl-1,2,3,3a,4,7a-hexahydrothiopyrano[4,3-c]pyrazole 5,5-dioxide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20N2O2S
assistant