You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[5-[1-(1,3-benzoxazol-2-yl)ethylsulfanyl]tetrazol-1-yl]-1,5-dimethyl-2-phenylpyrazol-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H19N7O2S
assistant