You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-cyano-1,3-dioxo-6,7-dihydro-5H-pyrrolo[1,2-c]pyrimidin-2-yl)-N-[[(3R)-2,3-dihydro-1,4-benzodioxin-3-yl]methyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18N4O5
assistant