You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[(4R)-4-cyclopropyl-4-methyl-2,5-dioxoimidazolidin-1-yl]methyl]-N-phenylpiperidin-1-ium-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27N4O3+
assistant