You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3S,4S)-4-methyl-1-[1-(5-nitrothiophene-2-carbonyl)pyrrolidine-2-carbonyl]pyrrolidine-3-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C16H19N3O6S
assistant