You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[4-[4-(2,3-dihydro-1-benzofuran-5-ylmethyl)piperazin-4-ium-1-carbonyl]phenyl]methyl]pyrrolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H30N3O3+
assistant