You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S)-3-[[1-[4-[4-(methylamino)-1-propan-2-ylpiperidin-4-yl]butan-2-yl]piperidin-4-yl]amino]propane-1,2-diol into its molecular formula.
user
C21H44N4O2
assistant