You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule [(2R,5R,6R)-3,3,6-trimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl]sulfanylmethyl 2,2-dimethylpropanoate ?
user
C15H23NO4S2
assistant