You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S,5R)-2-[2-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]ethoxycarbamoyl]-7-oxo-1,6-diazabicyclo[3.2.1]octan-6-yl] sulfate;tetrabutylazanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H61N5O9S
assistant