You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R)-2-(benzylsulfonylamino)-3-[[(2S)-1-methoxy-1-oxopropan-2-yl]amino]-3-oxopropan-1-olate by IUPAC nomenclature, provide its molecular formula.
user
C14H19N2O6S-
assistant