You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(5-fluoro-6-morpholin-4-yl-4-sulfanylidene-1H-pyrimidin-2-yl)-1-[(2R)-2-methyl-2,3-dihydroindol-1-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21FN4O2S
assistant