You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-1-N-propan-2-yl-2-N-[[(2R,3S)-2-propan-2-yloxan-3-yl]methyl]pyrrolidine-1,2-dicarboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H33N3O3
assistant