You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[(2-methylpropan-2-yl)oxycarbonylamino]-3-pentan-3-yl-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,2]oxazole-6-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H30N2O5
assistant