You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[4-(3,5-dimethyl-1H-indol-2-yl)piperidin-1-yl]sulfonyl-3,5-dimethyl-1,2-oxazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H25N3O3S
assistant