You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(2-methylpropyl)-1,3,3a,4,6,6a-hexahydropyrrolo[3,4-c][1,2]oxazole;dihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C9H20Cl2N2O
assistant