You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3R)-N-[[4-(pyrrolidin-1-ylmethyl)phenyl]methyl]-2,3-dihydro-1,4-benzodioxine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H24N2O3
assistant