You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 1-[3-bromo-1-[(1S)-1-(2-chloro-4-fluorophenyl)ethyl]-7-methoxypyrazolo[4,3-d]pyrimidin-5-yl]pyrazole-4-carboxylate;sulfane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H19BrClFN6O3S
assistant