You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(3S,5R)-3,5-dimethylpiperidin-1-yl]-N-(4-methyl-3-morpholin-4-ylsulfonylphenyl)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H33N3O4S
assistant