You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (2S,5R,6S)-3,3,6-trimethyl-7-oxo-6-(2-phenylhexanethioylamino)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid ?
user
C21H28N2O3S2
assistant