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 identified by (3aR,8aS)-5-pyridin-2-ylsulfonyl-3a,4,6,7,8,8a-hexahydro-1H-[1,3]oxazolo[5,4-c]azepin-2-one ?
user
C12H15N3O4S
assistant