You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-1-methyl-N-[2-[[(2S)-oxolan-2-yl]methylcarbamoyl]phenyl]piperidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H27N3O3
assistant