You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloroprop-2-enyl (3aR)-1,5-dioxo-4-propan-2-yl-2,3-dihydropyrrolo[1,2-a]quinazoline-3a-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19ClN2O4
assistant