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 6-tert-butyl-3a,4,5,7a-tetrahydro-1H-[1,3]oxazolo[5,4-d]pyrimidine-2,7-dione .
user
C9H15N3O3
assistant