You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3aR)-1,5-dioxo-4-propan-2-yl-2,3-dihydropyrrolo[1,2-a]quinazoline-3a-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C15H16N2O4
assistant