You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (5S)-6-amino-7-oxospiro[4-thia-1-azabicyclo[3.2.0]heptane-3,3'-oxolane]-2-carboxylic acid .
user
C9H12N2O4S
assistant