You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[6-[2-(4,7-dichloro-5-fluoro-2-methylindol-1-yl)ethylamino]pyrimidin-4-yl]-3-ethoxythiophene-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H19Cl2FN4O3S
assistant