You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[cyclopropyl-(2,5-dimethylthieno[2,3-d]pyrimidin-4-yl)amino]-1-(4-fluorophenyl)ethanol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20FN3OS
assistant