You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[4-(2,6-dimethoxyphenyl)-5-pyrazin-2-yl-1,2,4-triazol-3-yl]-1-(5-fluoropyrimidin-2-yl)propane-2-sulfinamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H21FN8O3S
assistant