You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[[(2R)-oxolan-2-yl]methyl]-2-[[5-(3-piperidin-1-ylsulfonylphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28N4O5S2
assistant