You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,4-dimethyl-3-[3-[[7-(3-pyrrolidin-1-ylsulfonylphenyl)pyrrolo[2,1-f][1,2,4]triazin-2-yl]amino]phenyl]piperazin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H31N7O3S
assistant