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 (5R,6S)-2-methylsulfonylspiro[2-azabicyclo[3.1.0]hexane-6,5'-imidazo[5,1-a]isoindole]-5-ol .
user
C15H15N3O3S
assistant