You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[[3-(6-methoxypyrazin-2-yl)oxypiperidin-1-yl]sulfonylmethyl]-7,7-dimethylbicyclo[2.2.1]heptan-2-one .
user
C20H29N3O5S
assistant