You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,5R,7aR)-5-tert-butyl-7-methoxy-1-propan-2-yl-5,7a-dihydro-1H-imidazo[1,5-c][1,3]oxazol-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H22N2O3
assistant