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 (3aS,6aR)-5-(1-oxa-9-thiaspiro[5.5]undecan-4-yl)-2,3,3a,4,6,6a-hexahydro-1H-pyrrolo[3,4-c]pyrrole ?
user
C15H26N2OS
assistant