You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(benzylsulfonylmethyl)-3-(2,6-dimethoxyphenyl)-2-(6-ethoxypyridin-2-yl)imidazo[4,5-b]pyrazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H27N5O5S
assistant